A main player operates a controller while viewing a monitor game image displayed on a monitor. A sub player operates a terminal device while viewing a terminal game image displayed on an LCD of the terminal device. A game image that is substantially identical to the monitor game image viewed by the main player is displayed on the LCD. By touching a touch panel provided on a screen of the LCD of the terminal device, the sub player can generate various events at a position in a game world corresponding to a touched position.