The invention performs communication in an optimal operating environment. Communication units with a relatively high baud rate are used for the communication units (80, 81) that communicate, between a radiation source control unit (11) and an electronic cassette (13), detected signals output from detection pixels (65) of the electronic cassette (13) or an irradiation stop signal in response to the results of comparing the integrated value of the detected signals with an irradiation stop threshold value. A communication unit, which communicates wirelessly and at a lower baud rate than that for communicating detected signals or irradiation stop signals, is used for the communication unit (37) that communicates image data and the like between the electronic cassette (13) and the console (14).