A design and construction assistance device includes a first acquirer configured to acquire first information including at least dimension data of a construction material to be attached to a target surface, a second acquirer configured to acquire second information indicating the type of attachment structure when the construction material is attached to the target surface, a production drawing generator configured to generate a production drawing for processing the construction material on the basis of the first information, the second information, and processing rules set for each type of attachment structure, and an output configured to output the production drawing generated by the production drawing generator.
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