Distortion of a received signal due to intersymbol interference as well as to frequency offset is corrected. For this reason, a frequency offset correcting circuit 21 corrects a received signal based on a frequency-offset estimated value. A first CIR estimating circuit 22 estimates CIR estimated values at a first position according to a known training sequence in the corrected received signal. Also, a second estimating circuit 24 updates the CIR estimated values with the LMS algorithm according to the corrected received signals as well as to the decision value outputted from the equalizer 13 with the CIR estimated values at the first position as initial values and obtains CIR estimated values at a second position apart from the first position. A phase deviation detecting circuit 15 computes phase deviations based on CIR estimated values at the first position as well as on CIR estimated values at the second position, and an averaging circuit 26 averages the phase deviations, and outputs the averaged value to the frequency offset correcting circuit 21 as a frequency-offset estimated value.