A camera picks-up an image external of a game machine and outputs image pick-up data Dv. A display control part controls the camera to pick-up an image and outputs the image pick-up data DV to an external device. In this case, a display device for displaying an image for a game is provided. When prescribed conditions are satisfied, the display control part controls the display device to display an image based on image data Dp extracted from the image pick-up data Dv as a part of the image for a game.