In a system including analog circuits of multichannel, channels which have a short distance therebetween are grouped so as to be included in the same group. During a reception period, a common correction signal is supplied to master channels allocated to the respective groups, and received signals are supplied to slave channels other than the master channels. A correction coefficient which tracks a characteristic fluctuation of each group is continuously searched for through continuous comparison between outputs of the respective master channels, and an output of each slave channel is corrected by using the correction coefficient of a group including the slave channel.