CAD Data Processing Device and Processing Method

The present invention provides a processing device and a processing method capable of optimization of CAD data merge and of minimizing an omission and an error in the merging operation. The processing device for three-dimensional CAD data having a plurality of elements and attribute data associated with each of the plurality of elements includes means for reading a plurality of pieces of CAD data, attribute extraction means for extracting the attribute data from first CAD data, correspondence relation extraction means for extracting a correspondence relation using positional information included in the first CAD data and second CAD data, attribute attachment means for attaching the attribute data extracted from the first CAD data to the second CAD data based on the extracted correspondence relation, and means for outputting the data provided with the attribute data.