There is provided an image processing system including an image supply unit arranged to transmit image data by wireless communication, an image receiving unit arranged to receive the image data supplied from the image supply unit, a first lighting unit arranged to illuminate an area in which the wireless communication with the image supply unit is possible, a detecting unit arranged to detect whether the image supply unit is in the area, and a controller arranged to control image communication between the image supply unit and the image receiving unit in accordance with an output of the detecting unit.