1. An image processing apparatus comprising: a display; a document image accepting unit for accepting input of an obtained document image; a display control unit for causing a preview image of individual pages of the document image accepted by said document image accepting unit to be displayed on said display in a manner such that the preview image continuously moves in a prescribed direction from a first side of said display to a second side of said display and, unless movement of the preview image is stopped based on a user operation, disappears off said second side of said display; an operation accepting unit for accepting (i) said user operation to selectively stop the movement of the preview image of any individual page of the document image, and (ii) an operation of image editing for document images, which are series of document images accepted by said document image accepting unit, including the document image corresponding to the preview image moving on said display; and an editing unit for performing the image editing accepted by said operation accepting unit for said document images, wherein when the operation accepting unit receives said user operation to selectively stop the movement of the preview image of a particular page of the document image, the operation accepting unit further enables acceptance of image editing of the stopped preview image of the particular page.