| 摘要 |
A large amount of information on unsteady events each occurring at a plant at a time not predicted by the user is superposed on contents of a display of existing drawings in a form that allows the information to be recognized by the sense of sight with ease. When an unsteady event such as an alarm related to an object, represented by an existing figure on a picture, being monitored at the plant occurs, the unsteady event is represented by a balloon-like figure newly drawn in an unsteady-event display on the picture. Then, in order to show that the unsteady event is related to the monitored object represented by the existing figure, the balloon-like figure is connected to the existing figure by a straight line which serves as a string tied to the balloon. Inside the balloon-like figure, a string of characters is displayed for explaining the unsteady event. When a confirming operation is carried out by the user to acknowledge the occurrence of the unsteady event, the drawing of the unsteady event changes to another balloon-like figure which has an attribute representing the completion of processing of the confirming operation. It is not until a solution to the occurring unsteady event found later that the other balloon-like figure disappears.
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