To provide an equalization apparatus, having high estimation accuracy of transmission line response with a reduced number of arithmetic operations.

In an equalizer 1 for the OFDM, a divider 2 divides a received OFDM signal Y(m, k) into a received pilot signal Y(m, kp) and a data signal Y(m, kd). A pilot pattern generator 3 generates a known complex amplitude X(m, kp), and a divider 4 divides the received pilot signal Y(m, kp) by X(m, kp), to output a transmission line response Y(m, kp)/X(m, kp). An IFFT computing element 5 performs IFFT (Inverse Fast-Fourier Transform) on the response Y(m, kp)/X(m, kp), which is converted into an impulse response h0. Noise is eliminated from the response h0 by a noise elimination filter 6, and thereafter up-sampling processing is performed in an up-sampling portion 7. Thus the obtained signal is converted into an impulse response h2. An FFT computing element 8 performs FFT (Fast-Fourier Transform) on the response h2, to output an estimated transmission line response Hc(m, kd). A divider 9 divides the data signal Y(m, kd) by the estimated transmission line response Hc(m, kd), to output an equalized data Y(m, kd)/Hc(m, kd).