INFORMATION PROCESSING SYSTEM, CONTROL METHOD, AND PROGRAM STORAGE MEDIUM

摘要

In order to enable a user's portable terminal to be authenticated by a method which is easy for the user, a control device (2300) of this information processing system (2000) uses terminal information transmitted from a portable terminal (2100) and containing a first identifier to generate a second identifier, which is returned to the portable terminal (2100). The portable terminal (2100) presents the obtained second identifier in a visual manner. When the control device (2300) detects, on the basis of a photographic image from an imaging device (2200) which photographs a predetermined imaging range (10), that the generated second identifier has been presented visually by the portable terminal (2100), the control device authenticates that portable terminal (2100).