PURPOSE: To make it possible to easily perform data setting for driving and controlling a stepping motor to the mechatoronics control CPU.

CONSTITUTION: This simulator comprises an input section 2 capable of inputting control system data for driving a stepping motor in accordance with a guide sentence indicated on the screen of a display section 4, and an automatic computing section 5 for calculating speed profile of the stepping motor in accordance with the control system data input from said input 2 and for displaying the input data from the input section 2 and the results of calculations in the computing section 5. At the same time, the display section 4 displays the results of execution when a mechatoronics control CPU6 has driven the stepping motor in accordance with the speed profile obtained from the computing section 5, and a simulator control 3 performs an overall control for the input section 2, computing section 5 and display section 4.