The invention provides an acoustic echo canceler which realizes sufficient echo suppression processing on an auditory sense which matches with an amount of calculation and realizes a good speech quality. The acoustic echo canceler includes a first analysis filter bank for dividing a reception signal into a plurality of sub-bands, a plurality of adaptive filters for individually producing false echo signals from the reception signal after divided into the sub-bands, a second analysis filter bank for dividing an input signal into a plurality of sub-bands, a plurality of subtractors for subtracting the false echo signals corresponding to the sub-bands from the input signal after divided into the sub-bands, and a synthesis filter bank for composing outputs of the subtractors. The acoustic echo canceler further includes a band information calculation section for estimating influences of the echoes for the individual sub-bands and determining a priority order based on the estimation. Each of the adaptive filters determines processing to be executed thereby based on the priority order.