To provide a network game system that smoothes the introduction of a game.

When game devices (2100, 2110 and 2120) take part in the same game, screens necessary to users are displayed on the displays (2105, 2115 and 2125) of the game devices. For example, characters (2107, 2117 and 2127) corresponding to the users of the game devices are displayed in the displays. Controllers (2109, 2119 and 2129) are connected to the game devices, and the users perform a variety of operations by means of the controllers in performing a game. Users taking part in one game can not only compete or cooperate with each other but also communicate with each other in the world of a game.