A method performed by a terminal for inter-system network information interaction, comprising: receiving, by the terminal, a request message for acquiring history record information of the terminal transmitted by a network element of a system network, after the terminal successfully establishes a connection with the system network or the terminal transmits to the system network a connection establishment success message or reestablishment success message which carries an indication message that the history record information of the terminal is able to be acquired; and transmitting, by the terminal, history record information of other system networks except the system network, where the terminal had stayed, to the system network; characterized in that, the system network is a 3rd Generation Partnership Project, 3GPP, network, and the other system networks except the system network comprise a wireless local area network; or the system network is a wireless local area network, and the other system networks except the system network comprise a 3GPP network; and, wherein, when the system network is a 3GPP network, and the other system networks except the system network comprise a wireless local area network, WLAN, the history record information of the wireless local area network where the terminal had stayed comprises one or more of the following: quality information of a wireless signal at a recording moment of the terminal; information of a service performed by the terminal in the wireless local area network, the information of a service comprises QoS-related information of the service; when the system network is a wireless local area network, and the other system networks except the system network comprise a 3GPP network, the history record information of the 3GPP network comprises a cell ID of a cell where the terminal had stayed and a staying time during which the terminal had stayed in the cell; wherein the history record information of the other system networks except the system network where the terminal had stayed is saved and processed locally by the system network. receiving, by the terminal, a request message for acquiring history record information of the terminal transmitted by a network element of a system network, after the terminal successfully establishes a connection with the system network or the terminal transmits to the system network a connection establishment success message or reestablishment success message which carries an indication message that the history record information of the terminal is able to be acquired; and transmitting, by the terminal, history record information of other system networks except the system network, where the terminal had stayed, to the system network; characterized in that, the system network is a 3rd Generation Partnership Project, 3GPP, network, and the other system networks except the system network comprise a wireless local area network; or the system network is a wireless local area network, and the other system networks except the system network comprise a 3GPP network; and, wherein, when the system network is a 3GPP network, and the other system networks except the system network comprise a wireless local area network, WLAN, the history record information of the wireless local area network where the terminal had stayed comprises one or more of the following: quality information of a wireless signal at a recording moment of the terminal; information of a service performed by the terminal in the wireless local area network, the information of a service comprises QoS-related information of the service; when the system network is a wireless local area network, and the other system networks except the system network comprise a 3GPP network, the history record information of the 3GPP network comprises a cell ID of a cell where the terminal had stayed and a staying time during which the terminal had stayed in the cell; wherein the history record information of the other system networks except the system network where the terminal had stayed is saved and processed locally by the system network. quality information of a wireless signal at a recording moment of the terminal; information of a service performed by the terminal in the wireless local area network, the information of a service comprises QoS-related information of the service; when the system network is a wireless local area network, and the other system networks except the system network comprise a 3GPP network, the history record information of the 3GPP network comprises a cell ID of a cell where the terminal had stayed and a staying time during which the terminal had stayed in the cell; wherein the history record information of the other system networks except the system network where the terminal had stayed is saved and processed locally by the system network.