Each of receiving spreaded signals from K users via L channels for each user is de-spreaded with a spreading code allocated to each user. Interference components among signal components in the de-spreaded signal vector Z obtained are eliminated by a de-correlation filter (33) and pilot signals are detected by a pilot detection part (34) from the interference-eliminated signal vectors for multiple frames. Each of the detected pilot signals is divided by the pilot signal's known symbol to obtain a transfer function in a transfer function interpolation part (35) and a transfer function between consecutive pilot signals is estimated from the transfer functions of the consecutive pilot signals. A de-spreaded signal vector Z is supplied to a de-correlation filter (36) and interferences among signal components are eliminated and transmission distortion is also eliminated using the estimated transfer functions. Regarding the KL signal components obtained in the above process, L signal components corresponding to each user are composited by a phase compensation and composition part (37) so that K composite signals are generated. Those composite signals are level decided by a decision part (38) to regenerate K symbols from K users.