PURPOSE: To easily create the test data file of a standard step in a short time by combining only test steps corresponding t the module of an inspection object among the test steps for each module previously stored in an inspection device.

CONSTITUTION: In a host computer 1, a software program PO prepared by a worker to be used for the internal combustion engine of an automobile, for example, and constituted of plural modules S1-Sn is stored. On the other hand, a test data file DO for the program PO is created in personal computer 2 as follows; namely, condition files F1-Fm are previously prepared corresponding to the module included in any one of software programs for a change gear controller and traction controller or the like in addition to an internal combus tion controller to be used for the program PO. Afterwards, communication is executed with the computer 1 through a line 3 by the computer 2, the module title of the module S is read and the data is created.