The method comprises sorting the required machining into point machining mode, line machining mode and surface machining mode in accordance with the machining shape. Each of the machining modes is classified into a plurality of machining units. A plurality of tool combination lines, each consisting of the names of the tools to be used in each machining unit, as well as the sequence of unit, as well as the sequence of use of such tools, are stored in a tool combination memory. As the operator appoints one of the machining units, the tool combination line corresponding to the appointed machining unit is read out from the tool combination memory so that a series of tools to be used and the sequence of use of such tools are determined automatically within the machine in accordance with the thus read out tool combination line.
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