Game apparatus, game method, and game program

1. A game apparatus comprising:

a log information retrieval unit configured to retrieve log information associated with user identification information related to a plurality of registered users;

a game processing unit configured to start playing a game and configured to progress the game based on operation information by the registered users; an index value calculation unit configured to calculate, for each of the registered users, an index value indicating a possibility that the registered users will not perform a predetermined action within a predetermined period based on the log information retrieved by the log information retrieval unit; and

a privilege granting unit configured to grant a predetermined privilege, said predetermined privilege being advantageous in the game, to a specific user of the plurality of registered users based on the index value calculated by the index value calculation unit for each of the registered users, wherein granting the predetermined privilege comprises accessing a gameplay database comprising at least one game content, associating, with the specific user of the plurality of registered users, in the gameplay database, the predetermined privilege, and providing at least one effect within the game based on the predetermined privilege.

2. The game apparatus according to claim 1 , wherein the predetermined action includes at least one of an action related to participation in the game, an action during play of the game, and consumption of a predetermined game content associated with the game.

3. The game apparatus according to claim 1 , further comprising:

a specific event generation unit configured to regularly or irregularly generate a specific event, said specific event having an access restriction to a limited number of registered users of the plurality of registered users,

wherein the predetermined privilege includes at least one of a privilege configured to enable participation in the specific event, a privilege configured to facilitate participation in the specific event, and a privilege configured to produce an advantageous effect in the specific event.

4. The game apparatus according to claim 3 , wherein the specific event is an event in which a specific game content available during playing the game is one of: provided unconditionally in response to participation or provided upon satisfaction of a predetermined acquisition condition by participating, and

the privilege granting unit is configured to relax the predetermined acquisition condition as a privilege to produce an advantageous effect in the specific event.

5. The game apparatus according to claim 4 , wherein the game processing unit is configured to regularly or irregularly generate an event different from the specific event, and is configured to enable participation in the event from the plurality of registered users, and

the specific game content is available in the event during at least one of this time or a subsequent time, said specific game content configured to provide an advantageous effect during use.

6. The game apparatus according to claim 1 , wherein the privilege granting unit determines, from the plurality of registered users, a registered user whose possibility is greater than or equal to a predetermined threshold value as the specific user.

7. The game apparatus according to claim 1 , further comprising:

a grouping unit configured to divide the plurality of registered users into a plurality of groups according to the possibility,

wherein the privilege granting unit is configured to determine registered users belonging to a first group having a relatively high possibility as specific users, and is configured to grant a predetermined privilege to a predetermined user among the determined specific users, the predetermined privilege being more advantageous than a privilege of another user.

8. The game apparatus according to claim 1 , wherein the index value represents a possibility that the predetermined action, which has continued with a predetermined frequency by the registered users, will not continue with the predetermined frequency.

9. The game apparatus according to claim 1 , wherein the index value calculation unit calculates the index value representing the possibility at each of a plurality of time points after a current time point.

10. A game method executed by a computer, the method comprising:

retrieving log information associated with user identification information related to a plurality of registered users;

starting playing a game and progressing the game based on operation information by the registered users;

calculating, for each of the registered users, an index value indicating a possibility that the registered users will not perform a predetermined action within a predetermined period based on the log information; and

granting a predetermined privilege, said predetermined privilege being advantageous in the game, to a specific user of the plurality of registered users based on the calculated index value for each of the registered users, wherein granting the predetermined privilege comprises accessing a gameplay database comprising at least one game content, associating, with the specific user of the plurality of registered users, in the gameplay database, the predetermined privilege, and providing at least one effect within the game based on the predetermined privilege.

11. A non-transitory computer-readable medium on which is embodied game program instructions that, when executed, cause a computer to execute processes of:

retrieving log information associated with user identification information related to a plurality of registered users;

starting playing a game and progressing the game based on operation information by the registered users;

calculating, for each of the registered users, an index value indicating a possibility that the registered users will not perform a predetermined action within a predetermined period based on the log information; and

granting a predetermined privilege, said predetermined privilege being advantageous in the game, to a specific user of the plurality of registered users based on the calculated index value for each of the registered users, wherein granting the predetermined privilege comprises accessing a gameplay database comprising at least one game content, associating, with the specific user of the plurality of registered users, in the gameplay database, the predetermined privilege, and providing at least one effect within the game based on the predetermined privilege.

12. The game apparatus according to claim 7 , wherein the grouping unit is configured to divide the plurality of registered users into the plurality of groups according to the possibility by dividing the plurality of users into at least the first group having the relatively high possibility and a second group having a possibility lower than the first group;

wherein the grouping unit is configured to grant the predetermined privilege to the predetermined user based on a determination, based on an index value associated with the predetermined user and based on a membership of the predetermined user in the first group of the plurality of groups, that the predetermined user has a possibility above a threshold.

13. The game apparatus according to claim 12 , wherein the index value calculation unit is configured to calculate the index value based on a level of participation of each of the registered users in the game; and

wherein the possibility that the registered users will not perform the predetermined action is a probability that the registered users will leave the game based on the level of participation of each of the registered users.