A game system can implements a multiplayer game. The game system includes: a union event processing section that disposes a united object in an object space instead of player objects respectively operated by a plurality of players when a union event has occurred, and sets the plurality of players to a cooperative play state; an individual play processing section that controls the player objects respectively operated by the plurality of players based on input information input by each of the plurality of players; and a cooperative play processing section that controls the united object based on the input information input by the plurality of players, the union event processing section determining a relative advantage of positions of the player objects respectively operated by the plurality of players before occurrence of the union event, and determining a placement position of the united object based on determination results.