To solve the problems that a lot of time and man-hours are required for the investigation of abnormality caused in equipment and the replacement of the fault equipment and the reliability of a system is lowered as a result since the abnormality found by the self diagnosis or the like of field equipment is reported only to a host system.

When the abnormality is found in the self diagnosis or the like, alarm information is automatically reported through the Internet or the like to a vendor or the like. The reported vendor decides measures from the alarm information, instructs replacing work and the preparation of a replacing article and requests detailed study for recurrence prevention. Also, the result of the measures is returned to a user. Since a processing is quickly performed, the time until restoration is shortened and the reliability of the system is improved as a result.