The present application discloses an identifier interaction method, comprising sending, by a 3GPP access network entity, an identifier of a wireless local area network (WLAN) to the user equipment according to the priority information of the WLAN, where the identifier of the WLAN is an identifier of a WLAN that a home area operator of a user equipment (UE) allows the UE to access and/or an identifier of a WLAN that a roaming area operator of the UE allows the UE to access, and the 3GPP access network entity is in a roaming area in which the user equipment is located.