Method for preparing numerical control data for a machine tool

A method for preparing numerical control data for a machine tool by displaying various kinds of operation information on a display means for causing data necessary for preparing the numerical control data to be inputted and by inputting said data in accordance with said displayed information, comprising the steps of:

• selecting a work operation input screen for inputting working operations in accordance with first indications on said display means;
• inputting a series of working operations at said selected working operation input screen;
• selecting a working program input screen for inputting working programs;
• and
• inputting data at said working program input screen in accordance with second indications of input items required for working operations, said second indications being displayed on said display means by reading the working operations previously inputted at said selected working operation input screen, whereby a series of working programs are inputted to prepare said numerical control data.