Disclosed is easily possible to evaluate the power generation potential of a roof for a large number of buildings in a wide range such as city, and extracted to efficiently evaluate the power generation potential evaluation unit only roof solar panel is not installed, and to provide a power generation potential evaluation program. A surface model storage means, outline storage means, building model extraction means, roof surface model extraction means, terrain image storage means, template storage means, power generation equipment extraction means, roof surface model selection means, shape computing means, and I provide the potential evaluation means. [Selection Figure] Figure 4
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