A multi-access edge computing device configured to be connected to first and second networks with different radio access technologies comprises a routing module, a comparison module and a control module. The control module performs steps when determining a user device connected to the first network intends to switch to the second network, wherein the steps comprise: according to identity information of the user device, looking up a target address in a comparison table in the comparison module, 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 the first network interface and then assigning the target address identical to the original used address to the second network interface of the user device, and transmitting the temporarily stored data packet to the second network interface of the user device.