Each wireless LAN base station comprises priority queue table, a header analyzing circuit determining a priority of data transmitted from a wireless terminal based on a header of the data and the priority queue table, priority queues for storing data, a control circuit for enqueueing the data transmitted from the wireless terminal to the priority queue and updating the priority queue table with priority information transmitted from the host apparatus, and a transmission control circuit for transmitting the data which have been stored in the priority queues and the priority queue table. A host apparatus comprises a queue information table containing the priority queue tables of the base stations, and a control circuit for determining a priority of data between wireless terminals on the basis of the queue information table and transmitting the priority information to the plurality of wireless LAN base stations via which the data route.