To improve operability at the time of displaying the monitored state of a plant on a screen according to various displaying functions.

This plant monitoring device is provided with a full function menu interactive means 10 for displaying a full function menu in response to an interaction request from a display interactive device 2 and a function selection calling means 11 for accepting function and group No information recognized by the means, and retrieving the pertinent individual function processing means 12. Also, this plant monitoring device is provided with a system menu interactive means 20 for displaying a plant system classified menu and a system calling means 21 for accepting system and function information recognized by the means, retrieving the in-function group No whose display is requested from the information, and notifying the function and group No information to the individual function processing means 12. Also, this plant monitoring device is provided with the individual function processing means 12 for generating display data according to the notification from either the function selection calling means 11 or the system calling means 21 and a display arrangement processing means 13 for receiving display data generated by the individual function processing means 12, and outputting the display data to the display interactive device 2.