A monitoring system quantifies either a configuration change or a status change of a monitoring target, and displays a change value thereof. Furthermore, the monitoring target refers to either a monitoring-target apparatus or a component of a monitoring-target apparatus. Moreover, in a case where multiple monitoring information acquisition intervals are used a change value may be computed and displayed for each of multiple monitoring targets. There may also be a case in which a time axis of a chronological graph of monitoring numeric values and a time axis of a chronological graph of change values are displayed collectively.