PROBLEM TO BE SOLVED: To improve efficiency of operation for discriminating blank products in NC processing in which a sheet metal is processed into the blank products by numerical control.SOLUTION: A processing control apparatus 2 controls an NC processing machine 210 by transmitting to the NC processing machine 210, control information for instructing sheet metal processing on one or more pieces of blank products allocated on a standard length sheet material 123, on the basis of numerical control data acquired from an NC data storage device 31. Imaging devices 61A and 61B captures an image of a blank product group. Upon receiving specified information that indicates a specified blank product from a code reading device 4, a blank product discrimination apparatus 1 matches the captured image received from the imaging devices with a reference image generated from the numerical control data and used to discriminate the specified blank product, and discriminates the specified blank product. The blank product discrimination apparatus 1 generates presentation information that indicates the specified blank product and positions of the specified blank products within an image captured region, and transmits the same to a projection device 62. On the basis of the presentation information, the projection device 62 projects a pattern corresponding to the specified blank product on the positions of the specified blank products.SELECTED DRAWING: Figure 1
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