A transmitter capable of suppressing a peak of a transmission signal includes a frequency domain acquisition unit for obtaining a frequency domain signal from the signal for transmission; and a level control unit for controlling a level of the frequency domain signal obtained by the frequency domain acquisition unit to suppress a peak in a time domain transmission signal. Further, the transmitter includes a time domain conversion unit for converting the frequency domain signal into the time domain transmission signal whose level has been controlled by the level control unit; and a transmission unit for transmitting the time domain transmission signal.