An information processing method, applied to an access gateway, comprising: receiving (S100) a first message borne in a fixed network session, the first message comprising a data packet, a Quality of Service, QoS, parameter, and a fixed network session ID corresponding to the fixed network session; and mapping (S200) the fixed network session and a mobile network session according to the first message and pre-stored mapping information, so as to send the data packet in the first message to a User Plane Function, UPF; wherein the pre-stored mapping information comprises a pre-stored fixed network session ID, a pre-stored QoS parameter, a pre-stored mobile network session ID, and a pre-stored mobile network IP address; sending Control Plane Protocol request information to an access device, the Control Plane Protocol request information carrying the pre-stored fixed network session ID and the pre-stored QoS parameter; and either receiving Control Plane Protocol response information sent by the access device, and establishing the fixed network session with the access device, the Control Plane Protocol response information carrying the QoS parameter consistent with the pre-stored QoS parameter and the fixed network session ID consistent with the pre-stored fixed network session ID, or in response to a session re-establishment request sent by the access device, requesting, from an access and mobility management function, AMF, an updated QoS parameter corresponding to the fixed network session ID and consistent with the QoS parameter, and establishing the fixed network session with the access device according to the fixed network session ID and the updated QoS parameter. receiving (S100) a first message borne in a fixed network session, the first message comprising a data packet, a Quality of Service, QoS, parameter, and a fixed network session ID corresponding to the fixed network session; and mapping (S200) the fixed network session and a mobile network session according to the first message and pre-stored mapping information, so as to send the data packet in the first message to a User Plane Function, UPF; wherein the pre-stored mapping information comprises a pre-stored fixed network session ID, a pre-stored QoS parameter, a pre-stored mobile network session ID, and a pre-stored mobile network IP address; sending Control Plane Protocol request information to an access device, the Control Plane Protocol request information carrying the pre-stored fixed network session ID and the pre-stored QoS parameter; and either receiving Control Plane Protocol response information sent by the access device, and establishing the fixed network session with the access device, the Control Plane Protocol response information carrying the QoS parameter consistent with the pre-stored QoS parameter and the fixed network session ID consistent with the pre-stored fixed network session ID, or in response to a session re-establishment request sent by the access device, requesting, from an access and mobility management function, AMF, an updated QoS parameter corresponding to the fixed network session ID and consistent with the QoS parameter, and establishing the fixed network session with the access device according to the fixed network session ID and the updated QoS parameter. <EOS>