Wireless LAN base station device having antennas and transmission-reception portion

A wireless LAN base station device serving as one base station, comprising:

• plural antennas for making communication with a wireless terminal, each of said plural antennas having at least a part of an electric wave arrival range which does not overlap with electric wave arrival ranges of the other antennas;
• plural transmission-reception portions connected to said plural antennas;
• plural control processors for controlling said plural transmission-reception portions;
• and
• a central processor for controlling said plural control processors,
• wherein each transmission-reception portion measures a reception level or/and each control processor measures a communication error occurrence rate, and said central processor controls said plural control processors to select said transmission-reception portion so that the reception level is maximum or/and the communication error occurrence rate is minimum.