To provide an equipment maintenance state display system capable of exactly coping with a primary diagnosis for judging a deviation state from a threshold of an equipment maintenance state and improving the intuitivity of the diagnosis about this equipment management system.

In the equipment management system for collecting maintenance information to be used to diagnose and manage field equipment and displaying the maintenance information in a display device 10, the display device 10 has a transit displaying means 10a for displaying in graph temporal transit of maintenance data included in the maintenance information and a threshold setting means 10b for setting a threshold of the maintenance data and displaying in graph the threshold as well as the maintenance data.

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