1. A surrounding area monitoring apparatus comprising: an imaging device mounted on a vehicle that captures images around the vehicle; an image processing unit including a processor and a memory that are configured to: process images captured by the imaging device to detect a physical object lying around the vehicle; determine whether the physical object detected is a pedestrian or an animal; and provide a warning screen image to a display device, the warning screen image emphasizing the physical object that is within a specified area from the vehicle, wherein when the detected physical object is determined to be an animal and is within the specified area, the warning screen image is continuously displayed for a specified period after the animal has left the specified area.