Relay station and relay method

Provided is an intelligent relay that avoids reduction of communication speed and interference. The relay is characterized in comprising a first antenna, a second antenna, a transmission side circuit for converting a baseband signal into a transmission RF signal, a reception side circuit for converting the RF signal into the baseband signal, a switching unit for switching between the following two states: a first state, in which the first antenna is connected with the transmission side circuit and the second antenna is connected with the reception side circuit, and a second state, in which the first antenna is connected with the reception side circuit and the second antenna is connected with the transmission side circuit, and a communication control unit featuring the following functions: acquiring the baseband signal from the RF signal received from the first or second communication device through the reception side circuit and transmitting communication data contained in the baseband signal, after the communication data was subjected to a predetermined processing, to the other communication device through the transmission side circuit.