Abstract: An electronic settlement system with extremely high security based on the use of a mobile terminal with an electronic camera therein. Display units for commodity information provided at a place for payment with cash, a sales control server for managing the display units, a server for controlling the mobile terminals, and an authentication server authorizing the mobile terminals are connected to each other through the Internet, and the authentication server and the sales control server are connected to each other through a dedicated communication line.

Abstract: The present invention proposes a safe and quick individual certification method using a portable terminal. When a portable terminal 30 sends a request for certification to a certification server 10, the certification server 10 transmits query code for certification to the portable terminal 30. The portable terminal 30 transmits said query code to the certification server 10 via a reader 21 or the like and also via a sales management server 23 to be certified. The certification server 10 verifies the query code to that generated in the past, and returns a result of verification and personal data required by the sales management server 23 to the sales management server 23.