A frequency diversity transmitting and receiving system comprising a transmitter (1) which transmits after splitting each symbol of an input symbol sequence into a plural number K of chips and then modulates these with mutually differing carrier frequencies, and a receiver (2) which receives the transmitted signals from the transmitter and demodulates them with local frequencies which respectively correspond to the aforementioned K types of carrier frequency. A carrier frequency generator (13,14) generates, as the aforementioned carrier frequencies for the aforementioned K chips, K types of signal with preset initial phase, and a local frequency generator (22,23) generates, as the aforementioned local frequencies for the carrier frequencies, signals which are substantially in phase with the initial phase of the carrier.