To attain safety driving by providing a same broadcast frequency search device and an output device so as to allow the system to receive automatically a radio wave with a highest electric field strength in its resident area among radio waves of a same broadcast program anywhere in the country.

A reception device 3 able to receive a radio wave is provided in addition to a reception device 1, and the same broadcast frequency search device 4 is provided, which retrieves a broadcast frequency with a highest electric field strength at present among plural save broadcast program frequencies for the same broadcast program desired to be received, and the search device 4 retrieves the desired radio wave among radio waves received by the receiver 3. Then the radio wave retrieved by the search device 4 is detected by a frequency storage device 5, and a frequency comparison device 6 is provided, which compares whether or not the detected radio wave frequency is the same as the frequency of the broadcast outputted by the output device 2 and the output device 2 outputs the broadcast of the frequency retrieved by the search device 4 when the comparison indicates negation.