A compression-back section (32) compresses back spread-spectrum signals received from K users through L transmission lines based on the spread-spectrum codes assigned to the users and a reverse correlation filter (33) eliminates interference components between signal components of compressed-back signal vectors z. A pilot detecting section (34) detects pilot signals from the signal vectors, from which the interference components have been eliminated, over a plurality of frames and a transfer function interpolating section (35) finds transfer functions by dividing the detected pilot signals by the known symbols of the pilot signals and determines transfer functions between adjacent pilot signals from the transfer functions of the adjacent pilot signals. The compressed-back signal vectors (z) are supplied to another reverse correlation filter (36) and the interference between signal components are eliminated from the vectors z and, at the same time, transmission distortion is eliminated by using the determined transfer functions, thus generating KL signal components. A phase-correcting and synthesizing section (37) generates K synthesized signals by combining L signal components for each user and a discriminating section (38) discriminates the levels of the synthesized signals and reproduces K symbols from K users.