Communication terminal and method and program for controlling the same

A communication apparatus comprising:

• a first receiving unit that inputs an input signal to output a first receiving signal and that, in case of not detecting data in said input signal, outputs a non-data detection signal;
• a second receiving unit that inputs said input signal to output a second receiving signal and that, in case of detecting data in said input signal, outputs a data detection signal;
• and
• a selecting unit that selects said first receiving signal or said second receiving signal to output a third receiving signal;
• characteristics of said first receiving unit during a period of time said data is not being received thereto differing from characteristics of said second receiving unit during a period of time said data is not being received thereto;
• said first receiving unit terminating a receiving operation in case said data detection signal is output;
• said second receiving unit terminating a receiving operation in case said non-data detection signal is output;
• said selecting unit selecting said first receiving signal in case said non data detection signal is output;
• said selecting unit selecting said second receiving signal in case said data detection signal is output.

A control method for controlling a communication apparatus having two or more receiving units differing in characteristics from one another;

• said method comprising:
• deciding on presence or absence in an input signal of data to be received;
• and
• selecting one out of said two or more receiving units based upon the presence or absence of said data to be received and upon the characteristics of said receiving units.