1. A method of operating a polyp detection apparatus, the method comprising: generating an image of an object; detecting polyp candidate regions including a reflected light region, based on the generated image; determining whether each of the polyp candidate regions is the reflected light region based on a number of pixels of each of the polyp candidate regions and a number of pixels of an estimated reflected light region included in each of the polyp candidate regions; and displaying a final polyp region by excluding the reflected light region from the polyp candidate regions.