To provide a privileged service to only customers who have actually viewed an image for advertisement, in order to motivate customers to view the image.

A QR code pattern identifying an image of an image content for advertisement is added to the image content, and the image is displayed on a display device 5 for customers. In this state, a headquarters server 1 receives and acquires a photographic image which a customer has obtained by photographing the QR code pattern with his or her mobile terminal device 7, and customer information from the mobile terminal device 7 via a mobile communication network 6 and a network 3 and judges whether a QR code included in the photographic image is true or not, and the privileged service is given to the customer in the case that it is judged as a result that this QR code is obtained by photographing a regular QR code.