A multi-access edge computing device, configured to be connected to a first network and a second network that have different radio access technologies, comprising: a routing module configured to temporarily store a data packet; a comparison module storing a user device identity and address comparison table; and a control module connected to the routing module and the comparison module, and configured to perform steps when receiving a request for access to the second network from a user device and determining that the user device is connected to the first network, wherein the steps comprise: according to identity information of the user device, looking up a target address in the user device identity and address comparison table, and notifying the routing module to temporarily store a data packet corresponding to the user device and the first network; notifying the user device to release an original used address on an interface of the first network and then assigning the target address to an interface of the second network of the user device, wherein the original used address is an IP address for the user device to access the first network, the target address is an IP address for the user device to access the second network, and the target address is identical to the original used address; and transmitting the data packet that is temporarily stored to the interface of the second network of the user device. a routing module configured to temporarily store a data packet; a comparison module storing a user device identity and address comparison table; and a control module connected to the routing module and the comparison module, and configured to perform steps when receiving a request for access to the second network from a user device and determining that the user device is connected to the first network, wherein the steps comprise: according to identity information of the user device, looking up a target address in the user device identity and address comparison table, and notifying the routing module to temporarily store a data packet corresponding to the user device and the first network; notifying the user device to release an original used address on an interface of the first network and then assigning the target address to an interface of the second network of the user device, wherein the original used address is an IP address for the user device to access the first network, the target address is an IP address for the user device to access the second network, and the target address is identical to the original used address; and transmitting the data packet that is temporarily stored to the interface of the second network of the user device. according to identity information of the user device, looking up a target address in the user device identity and address comparison table, and notifying the routing module to temporarily store a data packet corresponding to the user device and the first network; notifying the user device to release an original used address on an interface of the first network and then assigning the target address to an interface of the second network of the user device, wherein the original used address is an IP address for the user device to access the first network, the target address is an IP address for the user device to access the second network, and the target address is identical to the original used address; and transmitting the data packet that is temporarily stored to the interface of the second network of the user device.