PURPOSE: To prevent the deterioration in availability of an evaluation system due to an operating mistake and also to perform an evaluation task at a high speed by taking out the action data by means of an output message monitoring means and eliminating the manual input of an instruction.
CONSTITUTION: The action data re taken out of a storage 13 by an output message monitoring means 174, and an input message setting means 175 orders a maintenance diagnostic processor 17 to perform the processing accordant with the action data. Thus the message data paired with the action data is taken out of the storage 13. When the processing accordant with the action data is over, the processor 17 outputs a prescribed message to an input/output device 18. The means 174 decides the end of an action accordant with the action data since the message outputted from the processor 17 is related to the message data taken out of the means 175. Then the means 174 takes out the next action data. Thus it is possible to prevent the deterioration of the system availability due to a human mistake and also to perform an evaluation task at a high speed.