A game system includes at least one image output device and a game apparatus. The image output device is connected to a display device via wiring. The game apparatus is capable of wirelessly communicating with the image output device and is connected via wiring to another display device different from the display device connected to the image output device. The game apparatus performs a game process and generates an image based on the game process. The generated image is displayed on the display device connected to the game apparatus. The generated image is also transmitted to the image output device. The image output device receives the image transmitted by the game apparatus. The image output device outputs the received image to the display device on which the image is displayed.
