A game system includes a plurality of game apparatuses, and the respective game apparatuses are connected so as to make a communication with each other. A virtual space in a communication game comprises a plurality of scenes. Out of the game apparatuses participating in each scene, a parent device (scene host) and a child device (scene visitor) of the scene are determined. During the game, the scene host performs an updating process of scene shared data to be shared with all the game apparatuses participating in the communication game and scene specific data to be shared with only the game apparatuses which exist in the scene where a user's own apparatus participates in.