PURPOSE: To minimize the gathered data volume by limiting monitor object items and displaying only information exceeding a preliminarily set and indicated reference at the time of issue of an editing and display request of gathered information.

CONSTITUTION: When a preliminarily determined event occurs, a monitor information gathering means 30 is called from a data base management system 20 with a monitor item number and data as the parameter and gathers information only with respect to monitor object items registered in a data base directory 2 by a monitor information indicating means 10 and outputs a monitor information gathering file 3. A monitor information display means 40 is started by the request from a user and edits and displays only information satisfying the display reference of monitor object items registered in the data base directory 2 by the monitor information indicating means 10. Thus, the gathered data volume is minimized.