1. An overhead image-reading apparatus comprising: an image acquiring unit that causes an image-reading unit to read continuously a page-turned bound medium to acquire images; a detection determining unit that determines whether there is any image without the appearance of a foreign object out of the images corresponding to the same page; and an output image acquiring unit that, when the detection determining unit determines that there is any image without the appearance of the foreign object, acquires the image without the appearance of the foreign object as an output image, and when the detection determining unit determines that there is not any image without the appearance of the foreign object, combines the images corresponding to the same page to acquire the output image.