A compensation apparatus configured to compensate a quadrature-demodulated signal output from a quadrature demodulator configured to perform quadrature demodulation using a signal of a carrier frequency, by removing an image component caused by the quadrature demodulator from the quadrature-demodulated signal, the compensation apparatus comprising: a signal generator configured to generate a reference signal having a predetermined bandwidth in a reception band, and configured to give the reference signal to an input side of the quadrature demodulator; a calculation section configured to calculate a compensation parameter for rejecting the image component, based on a signal obtained by quadrature-demodulating the reference signal with the quadrature demodulator; and an image component rejection section configured to reject the image component from the quadrature-demodulated signal based on the compensation parameter, wherein the reference signal includes a frequency band that is biased to either a higher-frequency side or a lower-frequency side with respect to the carrier frequency, and the calculation section including means for generating, as a reference signal replica, a signal on which the image component in the frequency domain is not superimposed, the signal being a part of the signal obtained by quadrature-demodulating the reference signal and output from the quadrature demodulator, and means for calculating the compensation parameter, based on a signal for calculation that includes the reference signal replica and an image component caused by the reference signal replica, and on the reference signal replica. a signal generator configured to generate a reference signal having a predetermined bandwidth in a reception band, and configured to give the reference signal to an input side of the quadrature demodulator; a calculation section configured to calculate a compensation parameter for rejecting the image component, based on a signal obtained by quadrature-demodulating the reference signal with the quadrature demodulator; and an image component rejection section configured to reject the image component from the quadrature-demodulated signal based on the compensation parameter, wherein the reference signal includes a frequency band that is biased to either a higher-frequency side or a lower-frequency side with respect to the carrier frequency, and the calculation section including means for generating, as a reference signal replica, a signal on which the image component in the frequency domain is not superimposed, the signal being a part of the signal obtained by quadrature-demodulating the reference signal and output from the quadrature demodulator, and means for calculating the compensation parameter, based on a signal for calculation that includes the reference signal replica and an image component caused by the reference signal replica, and on the reference signal replica. means for generating, as a reference signal replica, a signal on which the image component in the frequency domain is not superimposed, the signal being a part of the signal obtained by quadrature-demodulating the reference signal and output from the quadrature demodulator, and means for calculating the compensation parameter, based on a signal for calculation that includes the reference signal replica and an image component caused by the reference signal replica, and on the reference signal replica.