Apparatus and method of processing change of csg subscription in wireless communication system

PURPOSE: A method and a device for changing CSG subscription in a wireless communication system are provided to notify a CSG subscription change to an HNB if CSG subscription is changed while a CSG service is received, thereby taking a proper action for the CSG subscription change in the HNB. CONSTITUTION: A terminal and an HNB(Home eNodeB) are in a CSG(Closed Subscriber Group) service state(S910). An MME(Mobility Management Entity) notifies CSG expiration to an NAS(Non-Access Stratum) of the terminal(S920). The NAS instructs CSG subscription expiration to an RRC(S930). An AS(Access Stratum) of the terminal informs the CSG expiration to the HNB(S940). The HNB notifies RRC(Radio Resource Control) connection release to the terminal(S950). In an RRC idle state, the terminal performs a cell reselection procedure(S960).