To simultaneously achieve improvement of convenience in a transitional period where passback violation occurs frequently, and security in a stabilized period where passback violation decreases.

Frequency of passback violation that occur in a managed area is counted daily, and this daily frequency of passback violation is displayed as a trend TR of passback violation. An upper limit threshold line L1 and a lower limit threshold line L2 are set to the trend TR of passback violation. When the trend TR of passback violation falls below the lower limit threshold line L2, switching of the operation method from A to B is recommended. When the trend TR of passback violation exceeds the upper limit threshold line L1, switching of the operation method from B to A is recommended. The operation method A permits entry and exit, and sends out a warning only (the operation method whereby the regulation for the entry and exit is loose). The operation method B does not permit entry and exit (the operation method whereby the regulation for the entry and exit is strict).