PURPOSE: To relive the load on operators and to smooth a supervision.

CONSTITUTION: This equipment is provided with an input type decision means 22 deciding a type of data stored in a plant input information storage means 12 as to whether the data are internally calculated input data or primary input data, a primary input retrieval means 21 retrieving all primary input points used for calculating the calculation type of the designated internal calculation input and the internal calculation input data from a calculation formula table 11, and message output means 16, 18, 19 allowing the input type decision means 22 to decide whether or not an object input point is based on the internal calculation input depending on an output from alarm output means 13, 14, 15 and allowing the primary input retrieval means 21 to retrieve the input point when the object input point is based on the internal calculation input data and outputs the retrieval result to a display device on the basis of a message output index flag.