The present invention is directed to an image reading apparatus provided with an automatic document feeder (hereinafter referred to as an ADF). The apparatus enables registration of image data as one piece of data even when a document is read as a number of bundles (each bundle includes at least one page and is not more than the loading capacity of the ADF). Owing to this, when document images are divided into two or more bundles for successive reading, different read settings can be determined for the different bundles.