A method for a communication link establishing device to establish a communication link in a targeted communication system is provided. A source terminal transmits a source terminal's identification information and threshold value information for selecting a relative angle measurement target to neighboring terminals including a target terminal, and transmits a relative angle measurement request signal to the target terminal and the neighboring terminals. Upon receipt of a response signal for the relative angle measurement request signal from at least one of the neighboring terminals including the target terminal, a communication link with the selected communication target's terminal is established based on the information contained in the response signal.