This automatic CAD design system (100; 200) comprises: an acquisition unit (ACQ) that acquires building type information and site information that defines a site; a storage unit (120; 220) that stores community rule information and individual unit information that defines an individual unit; an extraction unit (EXT) that, on the basis of the acquired site information, extracts the community rule information to be applied to the site defined by said site information; a space calculation unit (SPC) that finds an existable space, which is the space in which a building allowed to be built on said site can exist, on the basis of the acquired site information and by referencing the extracted community rule information (building-to-land ratio, floor area ratio, setback regulation, height restriction, sun/shadow regulation, etc.); and an automatic design unit (AUD) that automatically designs, within said existable space, a building including a plurality of individual units on the basis of the acquired building type information and by referencing at least a portion of the extracted community rule information.
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