PURPOSE: To display the image of the back of a vehicle and service information only by one display device by displaying the image of the back of the vehicle at time of backing the vehicle and displaying service information received by a radio wave receiving system on the display device.

CONSTITUTION: A TV system CRT device 1 for checking the back of a vehicle is used as a display means for displaying both data, i.e. the image of the back of the vehicle and service information. The CRT device 1 automatically displays the image of a back checking photographing camera when the gear 6 of the vehicle is set to 'BACK'. On the other hand, the service information is successively and always stored in a storage part of the system during the ON state of a system switch independently of the ON/OFF state of an engine or the state of the gear 6, and when a driver turns on a reproducing button 5, the service information can be reproduced on the CRT device and retrieved. Since the image of the back of the vehicle and the service information can be displayed only by one CRT device, the device can be mounted on a narrow driver's room and the safety check of the back, the rapid reception of service and vehicle driving can be simultaneously attained.