A session management method, comprising: determining, by a first control plane network element in a first network, to manage a session, wherein the session is for providing a connection in the first network for a terminal for connecting to a second network, and the first control plane network element is a network element in the first network; and managing, by the first control plane network element, the session; wherein the determining, by a first control plane network element in a first network, to manage a session specifically comprises: determining, by the first control plane network element, that a second quality of service, QoS, parameter of user plane data of the terminal in the second network is inconsistent with a first QoS parameter of user plane data of the terminal in the first network, wherein the second network is a network accessed by the terminal through the first network, and wherein the second QoS parameter is inconsistent with the first QoS parameter means that the second QoS parameter is different from the first QoS parameter, or the second QoS parameter and the first QoS parameter do not comply with a preconfigured mapping relationship; wherein the managing, by the first control plane network element, the session comprises: managing, by the first control plane network element, the session based on the second QoS parameter. determining, by a first control plane network element in a first network, to manage a session, wherein the session is for providing a connection in the first network for a terminal for connecting to a second network, and the first control plane network element is a network element in the first network; and managing, by the first control plane network element, the session; wherein the determining, by a first control plane network element in a first network, to manage a session specifically comprises: determining, by the first control plane network element, that a second quality of service, QoS, parameter of user plane data of the terminal in the second network is inconsistent with a first QoS parameter of user plane data of the terminal in the first network, wherein the second network is a network accessed by the terminal through the first network, and wherein the second QoS parameter is inconsistent with the first QoS parameter means that the second QoS parameter is different from the first QoS parameter, or the second QoS parameter and the first QoS parameter do not comply with a preconfigured mapping relationship; wherein the managing, by the first control plane network element, the session comprises: managing, by the first control plane network element, the session based on the second QoS parameter. determining, by the first control plane network element, that a second quality of service, QoS, parameter of user plane data of the terminal in the second network is inconsistent with a first QoS parameter of user plane data of the terminal in the first network, wherein the second network is a network accessed by the terminal through the first network, and wherein the second QoS parameter is inconsistent with the first QoS parameter means that the second QoS parameter is different from the first QoS parameter, or the second QoS parameter and the first QoS parameter do not comply with a preconfigured mapping relationship; wherein the managing, by the first control plane network element, the session comprises: managing, by the first control plane network element, the session based on the second QoS parameter.