A PHY-equipped radio LSI and a radio communication method capable of transmitting data without fail while maintaining a beacon interval. Using a selector which is switched by a beacon transmission signal output from a beacon register, a data transmission request signal is switched for transmitting data from a RAM to a PHY part, and a transfer is started when this signal goes to “1. ” In this way, for transmitting beacon data, the beacon data has been previously transferred to the RAM, and the beacon data is transmitted at the time of beacon transmission interval with the PHY part remaining in a transmission state, so that the beacon interval can be maintained. In addition, it is possible to prevent a failure in the transmission of transfer data due to the state of the PHY part.