PURPOSE: To reduce the number of external connection terminals to facilitate IC- implementation by providing a selector switch between an IF transformer connection terminal and a power source and selecting outputs of FM and AM signal processing means on a basis of the potential change of this IF transformer connection terminal.

CONSTITUTION: Switch means 50 is provided between power source Vcc and one terminal 18 out of connection terminals 15 to 18 supplying power VCC to the coil of IF amplifier circuits 210 and 341 or freqency converter circuit 320, in a receiving circuit which is equipped with plural receiving channeals including frequency converter circuit 320 connected to high-frequency amplifier circuit 310 or AM and FM IF amplifier circuits 210 and 341 and selects the output by signal switching means 400 and outputs it. Then, signal switching means 400 incorporated into semiconductor integrated circuit 100 together with IF amplifier circuits 210 and 341 and frequency converter circuit 320 is switched by the potential change of switch means 50 to make FM and AM signal processings possible, thereby reducing the number of external connection terminals of circuit 100 and facilitating integration.