Abstract: In a channel selecting circuit, there are four dividers. A first divider divides a local oscillating signal from a tuner. A second divider divides a reference output signal from a reference oscillator. A third divider divides the output from the first divider. A fourth divider divides the output from the second divider. A first controller changes the ratio of the frequency division in the first divider so as to obtain a synchronous voltage, which is supplied to the tuner, according to a selected channel. That is, the outputs from the first and the second dividers are compared by a phase comparator. The output of the phase comparator is supplied to the local oscillator of the tuner as the synchronous voltage. After the synchronous voltage becomes stable, a second controller tunes the real frequency of the broadcasting signal of the selected channel by changing the ratio of the frequency division in the first divider according to the output of a detector.