Apparatus and mehtod for handover in a heterogeneous wireless communication system

A handover apparatus and method in a different wireless communication network are provided to perform handover on a call when an LTE/SAE system and a CS system cannot be simultaneously connected. A CS(Circuit Switching) interface(312) transmits/receives data and a control signal to/from a CS network. An LTE/SAE(Long Term Evolution/Service Architecture Evolution interface)(313) transmits/receives data and a control signal to/from an LTE/SAE network. An IMS(IP Multimedia Subsystem) interface(314) transmits/receives data and a control signal to/from an IMS network. When handover to a BS(Base Station) of the CS network by a terminal via the CS interface, a controller(311) controls to request handover from the BS of the CS network to establish a radio link, establish an IP bearer, request a counterpart terminal communicating with the terminal via the LTE/SAE interface to change a destination of a call management unit with respect to a currently established call to establish an IP bearer between the call management unit and the counterpart terminal, and provide traffic received via the LTE/SAE interface to a bearer established with the base station of the CS network via the CS interface.