Game system

1. A server device connected via a network to a plurality of terminal devices each operated by a player, the server device controlling a battle game in which the player battles with an opponent character, the server device comprising:

a game content ownership-information storage unit configured to store game content ownership information indicating a player owns one or more game contents, wherein the one or more game contents owned by the player include a first game content;

a game content information storage unit configured to store game content information associated with individual ones of the one or more game contents owned by the player, the game content information including information characterizing the individual ones of the one or more game contents through parameter values;

a specific attribute information storage unit configured to store in association with the player, specific attribute information indicating the first game content is effective against the opponent character in a battle; and

a selection unit configured to

select, from the one or more game contents owned by the player, the first game content based on the specific attribute information indicating the first game content is effective against the opponent character in the battle,

adjust a parameter value in the game content information associated with the first game content to determine an effective value for the first game content against the opponent character in the battle, and

determine the first game content should be used in the battle game by the player based on the effective value determined for the first game content.

2. The server device of claim 1 wherein determining the first game content should be used in the battle against the opponent character based on the effective value determined for the first game content by the selection unit comprises:

comparing the effective value determined for the first game content with a parameter value in the game content information associated with a given one of the one or more game contents owned by the player other than the first game content; and

determining the effective value determined for the first game content is greater than the parameter value in the game content information associated with the given one of the one or more game contents owned by the player other than the first game content.

3. The server device of claim 1 further comprising:

a player information storage unit configured to store a parameter value of the player in association with the player;

an opponent character information storage unit configured to store a parameter value of the opponent character in association with the opponent character; and

a battle performing unit configured to perform the battle game based on the parameter value of the player, the effective value of the specific game content, and the parameter value of the opponent character if the selection unit selects the specific game content.

4. The server device of claim 1 further comprising a specific attribute information updating unit configured to cause the specific attribute information storage unit to store, in association with the player, the specific attribute information indicating the first game content is effective against the opponent character in a battle by virtue of the first game content was effective against the opponent character in a previous battle.

5. The server device of claim 1 , wherein the specific attribute information storage unit stores the specific attribute information stored in association with the player, in association with another player included in the same group as the player.

6. The server device of claim 1 wherein the selection unit is further configured to select a game content to be used by the player responsive to the player requesting, via the terminal device, an automatic selection of the game content by the sever device.

7. The server device of claim 3 wherein the player information storage unit is configured to store a maximum value of the number of game contents usable by the player in association with the player, and the selection unit is configured to select one or more game contents to be used by the player such that the number of game contents to be used by the player does not exceed the maximum value for the player stored in the player information storage unit.

8. The server device of claim 3 wherein the game content information storage unit is further configured to store, in association with a game content, item points to be consumed on use of the associated game content,

and wherein the player information storage unit is configured to store a maximum value of the number of item points consumable by the player in association with the player,

and wherein the selection unit is configured to select one or more game contents to be used by the player such that the sum of item points of the game contents to be used by the player does not exceed the maximum value of the number of item points consumable by the player stored in the player character information storage unit.

9. The server device of claim 8 wherein the selection unit is further configured to select, from the game contents owned by the player, one or more game contents to be used by the player in the battle game, based on the item points of the game content, the parameter values of game contents other than the specific game content, and the effective value of the specific game content.

10. The server device of claim 1 , wherein the first game content owned by the player includes a weapon item, an armor item and/or an magic item.

11. The server device of claim 1 , wherein the parameter values in the game content information for characterizing the individual ones of the one or more game contents include parameter values related to offensive power and/or defensive power of the individual ones of the one or more game contents.

12. A method using a computer connected via a network to a plurality of terminal devices each operated by a player, the computer controlling a battle game in which the player battles with an opponent character, the method comprising the steps of:

storing one or more game contents owned by a player, the one or more game contents owned by the player including a first game content;

storing game content information associated with individual ones of the one or more game contents owned by the player, the game content information including information characterizing the individual ones of the one or more game contents through parameter values;

storing, in association with the player, specific attribute information indicating the first game content is effective against the opponent character in a battle;

selecting, from the one or more game contents owned by the player, the first game content based on the specific attribute information indicating the first game content is effective against the opponent character in the battle;

adjusting a parameter value in the game content information associated with the first game content to determine an effective value for the first game content against the opponent character in the battle; and

determining the first game content should be used in the battle game by the player based on the effective value determined for the first game content.