To provide an operating procedure preparing system with which labor and time for preparing an operating procedure can be saved and operating procedure data can be recycled.

Concerning this system, the input/output of an expert system 3 is performed by mounting a software for sharing the start of a program and a data file with a work station mounting the expert system 3, and a personal computer (PC) 1 is provided for performing the input of an operation purpose while mounting a table calculation software. Then, an operating procedure table prepared by the expert system is transformed to the data of a CSV format readable for the table calculation software and dispatched to the PC, the procedure table is edited by the table calculation software on the PC, and this edited result is transformed to internal procedure data and preserved by the expert system.