To prevent a wrong operation signal from being output to a plant apparatus.
An operation processing item group effective determination annunciation means 10 annunciates a relevant operation processing item only when an operation processing item extracted by referring to an operation processing item group effective index file 11 created by collecting information of whether operation processing items are effective or not according to an operation procedure and an operation processing item group information file 13a created by collecting information for extracting the operation processing items from operation information inputted on an operation procedure basis is effective as an operation procedure. An operation processing means 12a creates and outputs an operation processing signal. An operation procedure updating means 14 duplicates an effective index of the next procedure from an operation processing item group procedure information file for previously storing effective indexes as information on an operation procedure basis to the operation processing item group effective index file 11.
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