A common channel signaling network, and more particularly, an apparatus and method for interworking between heterogeneous No. 7 signaling networks are provided. Additional functions required for interworking between heterogeneous No. 7 signaling networks can be minimized by managing a signaling network and handling a signaling message, respectively, during interworking between different No. 7 signaling networks. In addition, the reliability and performance of a signaling network can be maximized by using an already established function of managing each signaling network.