Server device, control method performed by the server device, program, and terminal device

Abstract

An item can be provided to a user by a lottery and the item odds can be changed in accordance with a prescribed condition. A control method, performed by a server device connected via a communication line to a terminal device operated by a user, can be initiated by selecting a lottery mode from among a plurality of lottery modes. Following the selection of the lottery mode, the system may hold a drawing from among a plurality of types of items on the basis of the selected lottery mode, and, following the holding of the drawing, may ensure that the won item is provided to the user via the terminal device.

What is claimed is: 
     
         1 . A control method performed by a server device, the server device connected via a network to a terminal device configured to communicate with the server device, the control method comprising:
 determining a game progress level of a user within a game;   selecting, with the server device, one lottery mode from among a plurality of lottery modes, wherein selection of the lottery mode is based on the game progress level of the user;   upon selection of the lottery mode, holding a drawing from among a plurality of types of items on the basis of the lottery mode;   upon performance of the drawing, determining an item won via the drawing, and associating the item with the user as an acquired item.   
     
     
         2 . The control method according to  claim 1 , further comprising:
 storing, on the server device, one or more items already acquired by the user; and   prior to holding the drawing, increasing a winning probability of an item not yet acquired by the user by performing steps of:   checking the one or more items already acquired by the user; and   in the lottery mode, setting a probability of winning an item already acquired by the user to zero.   
     
     
         3 . The control method according to  claim 2 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         4 . The control method according to  claim 1 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         5 . The control method according to  claim 1 ,
 wherein, in the lottery mode, a probability of winning the item is higher than a second probability of winning the item provided in a second lottery mode in the plurality of lottery modes.   
     
     
         6 . A control method performed by a server device, the server device connected via a network to a terminal device configured to communicate with the server device, the control method comprising:
 receiving a user selection from a user;   selecting, with the server device, one lottery mode from among a plurality of lottery modes, wherein selection of the lottery mode is based on the user selection;   upon selection of the lottery mode, holding a drawing from among a plurality of types of items on the basis of the lottery mode;   upon performance of the drawing, determining an item won via the drawing, and associating the item with the user as an acquired item.   
     
     
         7 . The control method according to  claim 6 , further comprising:
 storing, on the server device, one or more items already acquired by the user; and   prior to holding the drawing, increasing a winning probability of an item not yet acquired by the user by performing steps of:   checking the one or more items already acquired by the user; and   in the lottery mode, setting a probability of winning an item already acquired by the user to zero.   
     
     
         8 . The control method according to  claim 7 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         9 . The control method according to  claim 6 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         10 . The control method according to  claim 6 ,
 wherein, in the lottery mode, a probability of winning the item is higher than a second probability of winning the item provided in a second lottery mode in the plurality of lottery modes.   
     
     
         11 . A server device that is communicatively linked to a terminal device via a network and configured to carry out steps comprising:
 determining a game progress level of a user within a game;   selecting, with the server device, one lottery mode from among a plurality of lottery modes, wherein selection of the lottery mode is based on the game progress level of the user;   upon selection of the lottery mode, holding a drawing from among a plurality of types of items on the basis of the lottery mode;   upon performance of the drawing, determining an item won via the drawing, and associating the item with the user as an acquired item.   
     
     
         12 . The server device according to  claim 11 , wherein the server device is further configured to perform steps of:
 storing, on the server device, one or more items already acquired by the user; and   prior to holding the drawing, increasing a winning probability of an item not yet acquired by the user by performing steps of:   checking the one or more items already acquired by the user; and   in the lottery mode, setting a probability of winning an item already acquired by the user to zero.   
     
     
         13 . The server device according to  claim 12 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         14 . The server device according to  claim 11 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         15 . The server device according to  claim 11 ,
 wherein, in the lottery mode, a probability of winning the item is higher than a second probability of winning the item provided in a second lottery mode in the plurality of lottery modes.   
     
     
         16 . A server device that is communicatively linked to a terminal device via a network and configured to carry out steps comprising:
 receiving a user selection from a user;   selecting, with the server device, one lottery mode from among a plurality of lottery modes, wherein selection of the lottery mode is based on the user selection;   upon selection of the lottery mode, holding a drawing from among a plurality of types of items on the basis of the lottery mode;   upon performance of the drawing, determining an item won via the drawing, and associating the item with the user as an acquired item.   
     
     
         17 . The server device according to  claim 16 , wherein the server device is further configured to perform steps of:
 storing, on the server device, one or more items already acquired by the user; and   prior to holding the drawing, increasing a winning probability of an item not yet acquired by the user by performing steps of:   checking the one or more items already acquired by the user; and   in the lottery mode, setting a probability of winning an item already acquired by the user to zero.   
     
     
         18 . The server device according to  claim 17 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         19 . The server device according to  claim 16 ,
 wherein at least one item information is associated with each of the plurality of types of item; and   wherein, in each of the plurality of lottery modes, a probability of winning at least one item is different based on item information associated with the at least one item.   
     
     
         20 . The server device according to  claim 16 ,
 wherein, in the lottery mode, a probability of winning the item is higher than a second probability of winning the item provided in a second lottery mode in the plurality of lottery modes.