PURPOSE: To hierarchically control a circuit diagram by imparting a destination mark showing plural destinations on the circuit diagram and setting parts infor mation classified by the destinations to a parts information table, to control unitarily the parts information of plural destinations and to efficiently correct and extract the parts information in a control system integrating and controlling the circuit diagrams of plural destinations.

CONSTITUTION: In accordance with the setting of a destination mark 15 to parts on a circuit diagram, a destination parts sheet 16 having an input field for inputting the parts information for every destination of the parts is displayed. In accordance with the input of the parts information for every destination in the input field on the destination parts sheet 16, the parts information for every destination of parts is set to a parts information table 9 to be preserved. As for the parts for which the destination mark 15 is set on the circuit diagram, the parts information for every destination is controlled by the parts information table 9.