Pre, A / D converter interleaving time, stored in the correction information memory correction information required to correct an error of the signal between the A / D converters of the plurality of N outputs. In this case, in order to be able to get the data required for the correction processing in a short time, from a signal generator, N / 2 times the frequency Fs of the sampling clock applied respectively to the A / D converters of the plurality of N A plurality of signal components positioned, respectively, the desired frequency band of up to each other within the band to a maximum of half of the frequency Fs of the sampling clock by a sampling of the respective A / D converter and inputs to the A / D converters of the plurality of N as the calibration signal including a signal component of said plurality appearing at different frequencies. By performing a spectrum analysis process for the A / D conversion signal A / D converters of the plurality of N outputs to the calibration signal, the correction data calculating unit obtains the amplitude and phase of the plurality of signal components , and updates the contents of the correction information memory by the correction information based on the phase and amplitude, the newly determined the correction information, and the newly determined.
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