In order to allow the pixel-oriented image files (10) to display icons (3) of a numerical control system (1) to produce and with little effort to be able to adapt to altered conditions, it is proposed image description files (5) with information about elements (6) and texts (15) of the graphic symbols, together with text files (13) and user files (7) in a first memory area (2), to store. In a processing unit (8) are derived therefrom pixeloriented image files (10) generates, in the user files (7) fixed specifications with regard to image screen resolution, paints and other parameters correspond to. The user of such a numerical control (1), the graphic symbols (3) in a simple manner to adapt his needs.
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