To provide a plant monitor controller capable of specifying associated defective parts from among time-sequentially displayed failure items.

When any failure is generated, data collected from a plant 11 by a real time data server 10 are preserved in a message data base 7 as failure data, and the failure data are stored so as to be associated with each other in a failure information data base 8, and the picture of a plant is preserved in a picture data base 9, and a time-sequential display switch 12, an associated failure display switch 13, and an associated picture display switch 14 are arranged on an event picture 1 where the failure data are displayed so that the failure data of the message data base 7 and the information of the failure information data base 8 and the picture information of the picture data base 9 can be displayed.