PURPOSE: To improve the processing efficiency of the system by linearly managing the relativity of respective data definition by means of a relativity information file.

CONSTITUTION: A directory file 1, a source file 2, a means 3 extracting information to be related to data definition, a data definition related information extracting means 4, a related information storage area securing means 5, a data definition preparation means 6, a processing start indicator device 7, a related information file 8, a related definition information display judgement means 9, a related definition information display instruction device 10, a related definition information editing means 11, a related definition information display means 12 and a related definition information display means 13 are provided. The relativity of the respective data definition is linearly managed by the related information file 8. Thus, in grasping the related information, the necessity for reading and searching the data definition one by one can be eliminated and the processing efficiency in the aspect of operation can be improved.