Abstract: Provided is a system that enables inexpensive and accurate identification of the seating position of each user in a free address office without incurring additional equipment costs. The system identifies a user who has entered an office by performing a face verification operation which involves comparing a face image of an entering person who is entering the office acquired from an image captured by a first entrance camera, with the face image of each registered user for matching, and identifies the seating position of the user in the office by performing a person verification operation which involves comparing a first person image acquired from an image captured by a second entrance camera, with a second person image acquired from an image captured by an in-area camera to thereby associate a person who has entered the office with a corresponding person who is seated in the office.