1. An image processing apparatus comprising: document type classification means for determining whether input image data is image data for a text document or not; newspaper document classification means for determining whether the input image data is image data for a newspaper document or not; page-background region classification means for identifying a page-background region in the input image data; and page-background process means for, if the input image data is classified as the text document and but not the newspaper document and if a page-background removal process is to be performed to the input image data, performing a first page-background removal process to the image data, but if the input image data is classified as the text document and the newspaper document, not performing the first page-background removal process to the input image data.