1. A projector device comprising: a region designating unit that designates a specific region with respect to an image projected; a determining unit that determines a length as a reference for enlargement of an image portion defined within the region designated by the region designating unit; an image enlarging unit that enlarges the image portion in the region based on the length as the reference determined by the determining unit and a size of an entire image; and an enlarged image projecting unit that projects the enlarged image enlarged by the image enlarging unit.