System and method for electronic commerce using portable memory

An electronic commerce system using portable memory, comprising:

• the portable memory comprising:
• an interface unit connected to a purchasing terminal,
• memory for storing a unique identification code of the portable memory and an automatic access program for enabling automatic access to a sales server through the purchasing terminal, and
• control logic for controlling the portable memory;
• and
• a sales server comprising:
• a shopping mall provision module for providing an online shopping mall to a communication terminal connected through the Internet,
• a code reception module, connected to the communication terminal, for receiving the unique identification code of the portable memory through the communication terminal,
• an authentication processing module for authenticating access of the communication terminal by checking the received unique identification code,
• a payment processing module for performing processing so that a specific amount of money corresponding to a price of a product, purchase of which is requested, is subtracted from a specific amount of money, assigned to the received unique identification code and stored in a database, upon a request from the communication terminal for the purchase of the product, and
• a transfer processing module for performing processing so that part of the amount of money, assigned to the received unique identification code, can be assigned to another unique identification code upon a request from the communication terminal for transfer of money.