PROBLEM TO BE SOLVED: To provide a construction plan support system, a construction plan support program, and a storage medium which extract responsibilities and documents required for construction of a building being an object of CAD information, from the CAD information or information relating to it.SOLUTION: A construction plan support system 100 includes: a storage unit ST in which a plurality of responsibility certification criteria relating to a construction plan, responsibility elements relating to individual responsibility certification criteria, and a first rule defining a rule for extracting prescribed construction relevant information from CAD information are stored; an acquisition unit ACQ which acquires CAD information relating to the construction plan; a first extraction unit EXT1 which extracts prescribed construction relevant information from the acquired CAD information in accordance with the first rule; and a second extraction unit EXT2 which refers to the responsibility certification criteria stored in the storage unit to extract responsibility certification criteria which the extracted construction relevant information meets, and extracts responsibility elements relating to the extracted responsibility certification criteria.
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