Disclosed is a system and method for performing soft handover in a broadband wireless access communication system. An anchor base station transmits first information including channel assignment information of an active non-anchor base station when it is determined that a mobile station is to perform the soft handover, and when there are signals to be transmitted to the mobile station from the non-anchor base station, the non-anchor base station transmits second information including channel assignment information of the anchor base station when it is determined that the mobile station is to perform the soft handover, and when there are signals to be transmitted to the mobile station from the anchor base station, and the mobile station receives signals from the anchor base station and the non-anchor base station corresponding to the first information and the second information when it is determined that the mobile station is to perform the soft handover.