A game device includes an owned card storage unit for storing player cards owned by a game player, and a player card exchange unit for exchanging a player card owned by the game player with an exchangeable card presented by a CPU, wherein the player card exchange unit includes an exchangeable card presentation unit for determining the exchangeable cards based on the player cards owned by the game player to be presented on a screen, an exchange condition presentation unit for setting an exchange condition for exchanging the exchangeable card with the player card owned by the game player to be presented on the screen; and an exchange execution unit for approving the exchange of the player card and the exchangeable card when the player card that satisfies the exchange condition is selected by the game player, and updating the memory content of the owned card storage unit to a content after the approval of the exchange.