The present invention is a game device providing a game in which a plurality of target characters are selected from a plurality of owned characters that are owned by a player, the characters being used in an event. A storage device stores for each of the characters a selection prerequisite value needed for selecting a character, and the attack force of the character. A controller selects target characters from the plurality of owned characters so that the combined attacking force, which is the total value of the attack force of the target characters, is at a maximum within a range in which the total value of selection prerequisite values of the plurality of target characters is equal to or less than a selection permission value granted to the player.