1. An image processing apparatus with a display unit, comprising: a preview unit for previewing an image page by page on the display unit; a feature extraction unit for extracting a feature of an image; a feature storage unit for storing a feature of an image of a page previewed on the display unit; a regularity extraction unit for extracting a regularity from the feature of the image stored by the feature storage unit; and a correction menu display unit for displaying a menu for correcting a feature that does not agree if a feature of an image of a page previewed on the display unit does not agree with the regularity extracted by the regularity extraction unit.