User equipment includes a convertor that converts transmission target frequency domain signal into time domain signal; a quadrature modulator that applies quadrature modulation to the time domain signal; a cancellation signal generator that generates image leakage cancellation signal by converting image signal into time domain signal, and applying the quadrature modulation, wherein the image signal has a frequency component that is symmetrical to the transmission target signal with respect to center of transmission frequency range; an adjuster that monitors the frequency component of the image signal in output signal from the quadrature modulator, and that adjusts amplitude and a phase of image leakage cancellation signal so as to cancel the frequency component; and a combiner that combines output signal from the quadrature modulator with image leakage cancellation signal, and that provides a power amplifier with combined signal.