In a possible implementation, when the CP network element is an access and mobility management function AMF network element, the learning module 23 is configured to:
determine that the session parameter of the first session can satisfy the application that is not associated with the session parameter of the first session, where the session parameter of the first session includes at least one of a network slice identifier and a data network identifier;
or,
send a first request message to a policy control function PCF network element, and receive a first response message from the PCF network element, where the first response message includes the indication information, and the session parameter of the first session includes at least one of a network slice identifier and a data network identifier;
or,
send a second request message to a session management function SMF network element, and receive a second response message from the SMF network element, where the second response message includes the indication information, and the session parameter of the first session includes at least one of a network slice identifier, a data network identifier, and a service and session continuity SSC mode.
In another possible implementation, the sending module 24 is further configured to send the indication information to the SMF network element after the learning module 23 learns of that the session parameter of the first session can satisfy the application that is not associated with the session parameter of the first session.
In another possible implementation, the CP network element is an SMF network element and the learning module 23 is configured to: