1. An overhead image-reading apparatus comprising: an image acquiring unit configured to cause an image-reading unit to read continuously a page-turned bound medium to acquire images; a detection determining unit configured to determine whether there is an image without an appearance of a foreign object out of the images of the same page; and an output image acquiring unit configured to: when the detection determining unit determines that there is an image that does not contain an appearance of a foreign object, acquires the image that does not contain an appearance of a foreign object as an output image, and when the detection determining unit determines that all images contain an appearance of a foreign object, combines portions of two or more images of the same page to acquire the output image, the portions of the two or more images being portions of the same page that is not turned and that do not contain an appearance of a foreign object.