PROBLEM TO BE SOLVED: To generate 3D data of a building based on a building model assembled by a client. A building design support device detects an image acquisition unit that acquires a building model image obtained by imaging a building model in which parts are combined, and detects a code tag provided to the part from the building model image. Then, the ID of the part recorded in the code tag is read out, and the image analysis unit that determines the position and orientation of the part, and the building model based on the ID, position, and orientation of the part A 3D data generation unit that generates 3D data of a building and an output unit that outputs the generated 3D data of the building are provided. [Selection] Figure 9
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