An image processing apparatus includes a scanner for reading out documents, a first extraction unit for extracting text contained in document images, a second extraction unit for extracting at least one Web address from the text, a fetch unit for obtaining at least one Web page corresponding to the Web address, a first generation unit for generating a concatenated image by concatenating the document images with the Web page, and a second generation unit for generating an index indicating a corresponding relationship between the document images and the Web page in the concatenated image.