The invention provides an image reading device comprising: an image reading section that reads an image from an input document and creates input image data; a specifying section that extracts a specific character string or a specific image from the input image data created by the image reading section; a database that stores specific character strings, and an access target for rewriting information, in association with one another; an updating section that rewrites the input image data using the data obtained from the access target specified by the specific character string or the specific image extracted by the specifying section, creating output image data; and an image output section that outputs the output image data created by the updating section.