Patent ID: 8753211

Claim:
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.