present invention in this embodiment the virtual lan system which uses an intelligent switching hub device 1 comprising a plurality of ports 3 which include physical ports which can be physically connected or logical ports which can be logically connected and a frame switch 2 for outputting a frame 9 to one of the ports 3 according to a destination mac media access control address indicative of the one port as a destination and contained in the frame 9 received by one of the ports 3 is featured by that the frame switch 2 comprises a port table 4 having pointers a indicative of next tables corresponding to the respective ports 3 a plurality of protocol id tables 5 produced correspondingly to the respective pointers a and having pointers b indicative of respective next tables a plurality of virtual lan data tables 6 produced for respective virtual lan 39 s preliminarily determined in the frame switch 2 and having pointers c indicative of respective next tables and a port information 8 indicative of the ports 3 belonging to the respective virtual lan 39 s and a plurality of forwarding tables 7 produced correspondingly to the respective pointers c in the virtual lan data tables 6 and having port numbers of the ports 3 corresponding to the respective pointers a and a count value of a counter for continuously counting from a time at which the port numbers are registered incidentally the mac is a control using a mac sub layer among data link.