Patent ID: 8392833

Claim:
An image forming apparatus comprising: a display portion; a reading portion that transfers an original sheet by sheet and reads images of the original page by page; a detecting portion that detects a paper size of an original scanned by the reading portion; a paper size recording portion that, in accordance with image data of an original scanned by the reading portion, in order of the scanned original, records a paper size of the original; and a preview image display control portion that refers to a paper size of the original recorded by the paper size recording portion, distinguishes a top page of each of image data groups indicating the same paper size, and displays a preview of image data of each top page in every group of image data having the same paper size, wherein the preview image display control portion, on receipt of a next/previous skip instruction operation, displays a preview of image data of a top page in the group next/previous to the group in which the preview of the image data of the top page is currently displayed, the group being different in a paper size from the other group.