The present relates to a method for providing a terminal with a service in a mobile communication system which includes transmitting to mobility management entity an attach request message for initiating registration of the terminal having a virtual IP address with the mobile communication system; registering, at the mobility management entity, location of the terminal with a home subscriber server; and completing the registration by transmitting an attach accept message from the mobility management entity to the terminal. The present invention is capable of registering a terminal with a mobile communication system initially without bearer path and IP address allocation and, when a packet address to the terminal occurs, allocating the radio resource, bearer resource, and IP address through paging procedure, thereby proving the UE with the service.