Abstract: The present invention relates to a system of providing an agency service for customer management using a CTI (Computer Telephony Integration) technique and a method thereof. The system comprises a system of providing an agency service for customer management having a switchboard, a CTI server and a subscriber management module, and a call center of an enterprise mutually connected to the system. By means of such construction, the enterprise using the system can easily ascertain customer information previously constructed in the system to rapidly and effectively carry out counsel with a subscriber. The system of providing an agency service for customer management using a CTI technique can reduce costs of investment and maintenance required for expensive equipments, associated experts and the like.