To facilitate a procedure required for entering and leaving a gate for both of a visitor and the manager of a gatekeeper office and to improve the job efficiency of the gatekeeper office by storing the gate entering/leaving information of the visitor based on data read from recorded information relating to the visitor.

An ID card preparation means 14 is connected to respective personal computers 12 and an ID card for a new visitor is prepared. In the ID card, the company name and name, etc., of the visitor are stored. For the visitor, at the time of the next and succeeding visits, just by bringing the ID card closer to the modem 4 of one of the gatekeeper offices A-C, the information of the time of entering the gate at the time of the visit or the like is stored in a visitor list storage means 10. When the visitor leaves from a private branch, it is just brought closer to the modem 4 of one of the gatekeeper offices A-C. Thus, card information is stored in the visitor list storage means 10 along with the information of the time of leaving the gate of the visitor and the place of the gatekeeper offices A-C where the visitor leaves the gate, etc.