To increase the player's expectation in a fight game using game media, the present invention provides a server device that controls a game in which a player does a fight using game media in a game space through a network. The server device includes a storage unit configured to store player information including information about the game media that the player owns in the game space and about a status of the game media; a determining portion configured to determine whether a specific game medium among the game media that the player owns has satisfied a predetermined temporal requirement; and an updating portion configured to update the player information so as to change the specific game medium from a first status to a second status when the determining portion determines that the specific game medium has satisfied the predetermined temporal requirement.