A wireless LAN system comprising: a plurality of wireless LAN base stations (2,3), each of which is connected with wireless terminals (7,8) via a wireless LAN; and a host apparatus adapted to control priority of call originations of said wireless terminals (7,8), said call originations coming from said wireless terminals (7,8) via said plurality of wireless LAN base stations (2,3), wherein each of said plurality of wireless LAN base stations (2,3) comprises: a priority queue table adapted to control relations between headers of data and priorities; a header analyzing circuit adapted to determine a priority of data transmitted from a wireless terminal on the basis of a header of the data transmitted from the wireless terminal and said priority queue table; priority queues adapted to temporarily store data of respective priorities; a first control circuit adapted to enqueue the data transmitted from the wireless terminal to the priority queue of the priority determined by said header analyzing circuit and to update said priority queue table on the basis of priority information transmitted from said host apparatus; and a transmission control circuit adapted to transmit the data which have been stored in said priority queues in order of priority and to transmit said priority queue table to said host apparatus, and wherein said host apparatus comprises: a queue information table adapted to contain said priority queue tables of said plurality of wireless LAN base stations (2,3); and a second control circuit adapted to determine a priority of data to be transmitted between wireless terminals (7,8) on the basis of said queue information table and to transmit said priority information containing the determined priority and MAC address, communication port number, protocol number and codec type of the wireless terminal to at least one of said plurality of wireless LAN base stations (2,3) via which the data to be transmitted between the wireless terminals (7,8) route. a plurality of wireless LAN base stations (2,3), each of which is connected with wireless terminals (7,8) via a wireless LAN; and a host apparatus adapted to control priority of call originations of said wireless terminals (7,8), said call originations coming from said wireless terminals (7,8) via said plurality of wireless LAN base stations (2,3), a priority queue table adapted to control relations between headers of data and priorities; a header analyzing circuit adapted to determine a priority of data transmitted from a wireless terminal on the basis of a header of the data transmitted from the wireless terminal and said priority queue table; priority queues adapted to temporarily store data of respective priorities; a first control circuit adapted to enqueue the data transmitted from the wireless terminal to the priority queue of the priority determined by said header analyzing circuit and to update said priority queue table on the basis of priority information transmitted from said host apparatus; and a transmission control circuit adapted to transmit the data which have been stored in said priority queues in order of priority and to transmit said priority queue table to said host apparatus, and wherein a queue information table adapted to contain said priority queue tables of said plurality of wireless LAN base stations (2,3); and a second control circuit adapted to determine a priority of data to be transmitted between wireless terminals (7,8) on the basis of said queue information table and to transmit said priority information containing the determined priority and MAC address, communication port number, protocol number and codec type of the wireless terminal to at least one of said plurality of wireless LAN base stations (2,3) via which the data to be transmitted between the wireless terminals (7,8) route.