To surely transmit information transmitted from a radio transmitting body such as a portable machine to electronic control devices for controlling equipment in a vehicle without providing the electronic control devices with many antennas.

The information transmitted by the radio transmitting body is received by a plurality of electronic control devices provided in the vehicle, the electronic control devices mutually deliver and receive the information by radio, and the information transmitted from the radio transmitting body is transmitted to the electronic control devices for controlling the equipment in the vehicle. Accordingly, reception accuracy of the information transmitted from the radio transmitting body is enhanced.