Abstract: A computer-implemented method includes receiving a request from a user for a first product via a terminal installed on a place, allocating identification information to the user, tracking a user movement of the user during a time period between when the request is received and when the first product is provided to the user, identifying a second product that interests the user based on the tracked user movement, a plurality of product including the second product being presented to the user during the time period, associating the second product that interest the user with the identification information, and controlling a display device to display information regarding the second product, the display device being allocated to the identification information of the user.