Patent ID: 7216159

Claim:
A wireless LAN system for virtual LAN in which wireless terminals accommodated in a physically single LAN are virtually classified into a plurality of groups, comprising: a plurality of access points(AD) for establishing a wireless link with wireless terminals; and switching means for exchanging a frame between each access point and each virtual LAN, wherein each access point comprises: a data table for storing a correspondence relationship between a terminal ID specific to each wireless terminal and a virtual ID specific to a virtual LAN group to which the wireless terminal belongs therein; means for identifying a terminal ID registered in a frame received from each wireless terminal; means for inserting a virtual LAN tag in the received frame; means for referring to the data table based on the identified terminal ID and extracting a virtual ID corresponding to the terminal ID; and means for registering the extracted virtual ID in the virtual LAN tag and transferring it to the switching means, and the switching means comprises: means for identifying a virtual ID registered in a virtual LAN tag of a frame received from the access point; means for selecting a transfer destination of the received frame based on the identification result; means for deleting a virtual LAN tag from the received frame; and means for outputting the deleted frame of the virtual LAN tag to the selected transfer destination.