We developed an advertising system that enables users to interact with advertisements on a large display wall without any physical contact. The system recognizes positions of bodies or hands of users in front of the display by stereo cameras. The system recognizes a distance between a user and the display as the user’s interests in the advertisement, and changes two display modes according to the distance. One of the modes shows advertisements as many as possible to attract interests of passers-by. The other allows a user to interact with the advertisement on the display by recognizing a gesture of the user.