A COMMUNICATION DEVICE WHICH IS CONNECTED TO TERMINAL TO BE USED FOR TRANSACTION, AND TRANSACTION METHOD USING THE SAME

摘要

A conventional card payment system has a problem in that a user should possess a card for transactions and payment is performed using the card's serial number. Provided is an external communication apparatus for performing payments, installed in a mobile communication terminal, including: a terminal connector, connected to an input/output terminal of the terminal, for receiving/transmitting data; a wireless transceiver wirelessly receiving or transmitting data from/to an external system; and a data storage unit storing an ID and a registration telephone number for transaction certification; and a controller extracting a telephone number of a terminal in which the external communication apparatus is installed, comparing the extracted telephone number with the stored registration telephone number for certification, and issuing a transaction approval if the extracted telephone number is the same as the stored registration telephone number for certification.