Antenna switching in multiple radio terminal

A multiple portable phone comprising:

• a first antenna for a first communication system;
• a second antenna common to said first communication system and a second communication system;
• a switching circuit controlled based on a control signal;
• a receiving circuit provided for said first communication system, and connectable to said first and second antennas via said switching circuit;
• a transmitting and receiving circuit provided for said second communication system, and connectable to said second antenna;
• an impedance matching circuit connected to said switching circuit;
• and
• a control unit generating said control signal to control said switching circuit to connect said impedance matching circuit to a path from said second antenna to said transmitting and receiving circuit when said transmitting and receiving circuit carries out a receiving operation using said second antenna while said receiving circuit carries out a receiving operation using said first antenna.