Patent ID: 8255832

Claim:
An image processing device, comprising: a determining unit for determining whether image data corresponding to an input document is image data of an N-up document (N≧2) or image data of a 1-up document, wherein the N-up document is a document in which contents corresponding to N pages (N≧2) are arranged in one page; a first thumbnail generating unit for generating a plurality of first thumbnails as 1-up documents from each of the N pages arranged in the one page of the N-up document when the image data corresponding to the input document is determined to be the image data of the N-up document by the determining unit; a second thumbnail generating unit for generating a second thumbnail that is a thumbnail of the input document; a storage unit for storing both of the first thumbnails and the second thumbnail in a case where the image data corresponding to the input document is determined to be the image data of the N-up document by the determining unit, and storing the second thumbnail in a case where the image data corresponding to the input document is determined to be the image data of 1-up document by the determining unit; and a display unit for preview-displaying the first thumbnails generated from the image data of the N-up document by the first thumbnail generating unit and the second thumbnail generated from the image data of the 1-up document by the second thumbnail generating unit when an automatic 1-up preview is set, and preview-displaying the second thumbnail generated from the image data of the N-up document by the second thumbnail generating unit and the second thumbnail generated from the image data of the 1-up document by the second thumbnail generating unit when the automatic 1-up preview is not set.