In a communication apparatus for receiving signals of frequency channels, a synchronization determiner determines whether synchronization of a demodulated signal is established. A BER calculator calculates a pseudo BER of the demodulated signal with the synchronization established. A comparator detects a frequency channel having the lowest pseudo BER, that is, the best value of the evaluation scale defined for transmission quality. A correction value calculator calculates a correction value for a symbol clock frequency in each frequency channel, based on a symbol clock frequency deviation in the frequency channel having the best value of the evaluation scale.