A CTI system comprises a telephone terminal (12-2) having an ID tag (18-2), a server-connected main unit (11, 13) for controlling the telephone terminal, and an information processing terminal (16-1) having an ID reader and a communication unit (CU). By positioning the ID reader of the information processing terminal and the ID tag of the telephone terminal in close proximity to each other, the ID reader reads ID information of the ID tag in a non-contact manner. The information processing terminal sends the ID information read by the ID reader to the main unit by the use of the communication unit. The main unit associates the information processing terminal with the telephone terminal with reference to the ID information. The main unit is responsive to a request of the information processing terminal and carries out call control for the telephone terminal associated with the information processing terminal.