Patent ID: 7152114

Claim:
A server of a local area network in which the server is connected to a terminal via a communication line selected from a plurality of communication lines, the server comprising: a buffer for cumulating a predetermined quantity of latest transmission or reception data in each communication line for each MAC address that is unique to the communication line; and a switch processing portion for performing a switching process of the plurality of communication lines, including a switch request receiving portion for receiving from the terminal a request to switch the communication line and an address in the buffer indicating data received by the terminal, a line selecting portion for selecting an appropriate communication line in response to the request to switch the communication line, a switch instruction transmitting portion for transmitting an instruction to switch to the selected communication line and the address in the buffer indicating data received by the server, and a data destination switching portion for transferring packet data received for the terminal to the communication line after the switching, by rewriting a MAC address of packet data received and stored before the switching and a MAC address of packet data to be received after the switching, and by copying both the packet data to a buffer area of a MAC address corresponding to the communication line after the switching.