A game apparatus includes a video game machine. A CPU provided in the video game machine controls movements, etc. of a player character operated by a player. There exist a predetermined number of player characters (e.g., four persons), and all of them are assigned to players depending on the number thereof. For example, four player characters are assigned to one player in a 1P mode, and two player characters each are assigned to two players in a 2P mode. While playing a game, each player may change formations of the four player characters or plunder a player character existing in an array belonging to another player.