This application discloses a method applied to a scenario in which a terminal device moves from a first AN node to a second AN node. The method includes: receiving identification information of a to-be-activated session from the terminal device via the second AN node; sending a context release command to the first AN node when a signaling connection of the terminal device exits between an AMF node and the first AN node; receiving a context release complete message carrying identification information of an active session of the terminal device from the first AN node; when the to-be-activated session and the active session have a same session, sending a first request message to request to deactivate the same session to an SMF node corresponding to the same session; and after the same session is deactivated, sending, to the SMF node, a second request message to request to activate the same session.