To enable a receiver side to easily obtain an accurate synchronization signal in an OFDM signal transmitting/receiving system.

A transmitter side apparatus of this system has an IFFT circuit for generating a multi-valued QAM modulation signal, a guard interval setting circuit, and a clock signal generating circuit for driving both circuits. Pilot signals having a high frequency in which phases are to be set at predetermined values over a plurality of symbol sections are generated by the IFFT circuit. The pilot signals are set so as to exist in the integral number of wavelengths in the guard interval, to exist in the odd number of times half-wave length, to exist as signals in a real number sections, or to exist as signals having a single frequency by being multiplexed by four. Further, the pilot signals are continuously sent out over the plurality of symbol sections. A receiving apparatus side generates an accurate clock signal for driving the apparatus on the basis of the pilot signals.

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