To provide a radio controller which changes over to an optimum antenna without a mutual interference even when an identical bandwidth is used on the same notebook personal computer in different standards such as the radio LAN and the Bluetooth (R).
When a transmission or reception of the radio LAN and the Bluetooth (R) is simultaneously executed, a communication controller 21 changes over a Bluetooth (R) antenna 14 to a radio LAN communication antenna 13-2 which is far in view of a distance based on a transmission mode and a reception mode of the radio LAN and the Bluetooth (R), whereby the communication controller 21 reduces a mutual interference of radio waves even when the identical bandwidth is used on the same notebook personal computer in different standards such as the radio LAN and the Bluetooth (R), and can change over to the optimum antenna which can make an efficient data communication without lowering a throughput to the utmost.
MURASE ATSUSHI
Hiroki Naito
Daisuke Nagano