The present invention comprises: a first standby method including a mobility management entity (MME) in a wireless communication system that includes predicting an overload duration time when an overload occurs, deciding as a reconnection method of a user equipment (UE) one of a plurality of reconnection methods by using the overload duration time that is predicted, transmitting to an eNodeB information on the reconnection method of the UE that is decided, wherein the plurality of reconnection methods represent methods for the UE attempting a reconnection with the MME after a predetermined first standby time; a second standby time for the UE attempting reconnection with the MME after a second standby time that is longer than the first standby time; and an MME reselection method for the UE attempting the reconnection with an MME which is different from the MME.