Wibro network interworking method and system for wireless terminal

A WiBro network interworking method and system of a WLAN(Wireless Local Area Network) terminal are provided to manage QoS, traffic control and billing of users although users use an unlicensed band. An RS(Relay Station)(200) requests allocation of a dedicated CID(Connection Identification) corresponding to a QoS level of a corresponding terminal user according to an Internet access request of WLAN terminals(100a,100b,100c). A RAS(Radio Access System)(300) allocates a dedicated CID for an Internet access of the WLAN terminals according to the request of the RS. The RS maps the dedicated CID allocated by the RAS and a node ID of the WLAN terminals to provide an Internet service to the WLAN terminal user. The RS includes a WiBro connection manager for performing a WiBro initiation process with the RAS in a WiBro network, a Wireless LAN host AP for applying association to a corresponding terminal if a WiBro network connection request is received from the WLAN terminals, a WiBro interworking setting manager for setting a connection for WiBro network interworking of the WLAN terminals according to a used IP network if user authentication according to a request of the wireless LAN host AP is normally completed, and a mapper for mapping the dedicated CID allocated from the RAS and the node ID of the WLAN terminal.