It is possible to recognize that the received image data is captured by which imaging element. Respective transmission modules (46a, 46b) assign, to image data captured by a plurality of CCDs (12a, 12b) corresponding respectively to LEDs (11a, 11b), different radio frequencies according to the CCDs (12a, 12b) and simultaneously wirelessly transmit them, for example. A receiving device is provided with a general receiving circuit to receive the radio waves of different radio frequencies, and receives the transmitted image data.
