MONITORED STATE DISPLAY UNIT FOR MONITORING STATE CHANGE OF VARIOUS EVENTS OCCURRING ON COMMUNICATION NETWORK

A monitored state display unit for a monitoring system which has an object of improving the response to information request and easily determining fault point/fault condition. The display unit comprises event state information processing means which requests a collecting device to collect event information, and gives instructions as to the screen display method according to the state on receipt of the response notification to collection request or the state change information from the collecting device, screen information control means which controls the output of updating/displaying of displayed screen to a display means and receives the instruction input from an instruction input means, and screen transmission information control means which requests information necessary for the screen to be displayed next from the event state information processing means on receipt of the notification of input of instruction information. The display unit further comprises display method defining information storing means for defining the method of displaying on-screen mark corresponding to the event state, screen definition information storing means for defining the displayed screen, and screen transition information storing means for storing the screen transition information. The event state information processing means handles the information which is not transmitted from the collecting device as information of unchanged state, and changes the method of displaying mark for the mark of fault point.