"The controller 3 according to the present example embodiment includes a display unit 34. The processor 10 of the game apparatus 1 generates an image to be displayed on the display unit 34 of the controller 3, and sends the generated image data to the wireless communication unit 16. The wireless communication unit 16 wirelessly transmits the image data sent from the processor 10 to the controller 3. The controller 3 displays an image based on the received image data on the display unit 34. "