The present invention relates to a Net shopping method for performing Net shopping through the Internet with a portable terminal. The user freely makes product selections (Net shopping) at any time and place using a portable terminal 2. When the user proposes to conduct a transaction, transaction proposal information, payee information, and the amount of money are automatically sent from the Net shopping site to the portable terminal 2 and stored in the internal memory 22. Next, the user takes the portable terminal 2 to the automatic payment transfer device 4, connects the portable terminal to the payment transfer device 4, and transfers the internal data to the payment transfer device 4. The user can perform payment transfer operations with the payment transfer device 4 based on the order acceptance data. Thus the payment transfer process can be performed safely and with a simple operation.