Imformation providing system using qr code having authentication system

PURPOSE: An information providing system which uses a QR code having an authentication system is provided to supply content to a user by supplying information to a specific perform through a QR code. CONSTITUTION: A boor or a coupon(210) includes a QR(Quick Response) code and an authentication key obtained by a supplier. A terminal(240) includes a screen output unit, a QR code scanning unit, an ID/password input unit, a wired/wireless communication unit, and a memory. A main server(260) include ID/password database, authentication database, content database, and a memory. The authentication key and ID/password is transmitted/received through the wired/wireless communication unit of the main server.