A communications method, comprising: receiving (S501), by an access and mobility management network element, a message corresponding to a packet data unit, PDU, session from a session management network element, wherein the message comprises first information that is to be sent to a terminal through an N1 interface, the message does not comprise second information that is to be sent to an access network device through an N2 interface, and the PDU session is a PDU session that is established based on a non-3rd generation partnership project, non-3GPP, access; when the terminal is already registered with both the non-3GPP access and a 3GPP access and is in an idle state in the non-3GPP access, sending (S502), by the access and mobility management network element, a paging message to the terminal by using the 3GPP access; receiving (S503), by the access and mobility management network element, a service request message from the terminal in response to the paging message; skipping (S506), by the access and mobility management network element, sending of a PDU session update context request message to the session management network element; and sending (S505), by the access and mobility management network element, the first information to the terminal by using the 3GPP access; wherein the sending, by the access and mobility management network element, the first information to the terminal by using the 3GPP access comprises: sending, by the access and mobility management network element, a non-access stratum, NAS, message to the terminal by using the 3GPP access, wherein the first information is carried in the NAS message. receiving (S501), by an access and mobility management network element, a message corresponding to a packet data unit, PDU, session from a session management network element, wherein the message comprises first information that is to be sent to a terminal through an N1 interface, the message does not comprise second information that is to be sent to an access network device through an N2 interface, and the PDU session is a PDU session that is established based on a non-3rd generation partnership project, non-3GPP, access; when the terminal is already registered with both the non-3GPP access and a 3GPP access and is in an idle state in the non-3GPP access, sending (S502), by the access and mobility management network element, a paging message to the terminal by using the 3GPP access; receiving (S503), by the access and mobility management network element, a service request message from the terminal in response to the paging message; skipping (S506), by the access and mobility management network element, sending of a PDU session update context request message to the session management network element; and sending (S505), by the access and mobility management network element, the first information to the terminal by using the 3GPP access; wherein the sending, by the access and mobility management network element, the first information to the terminal by using the 3GPP access comprises: sending, by the access and mobility management network element, a non-access stratum, NAS, message to the terminal by using the 3GPP access, wherein the first information is carried in the NAS message. <EOS>