A document processing apparatus includes: a storage that stores a manner of a document on which a document processing is performed in a series of tasks; a creating unit that creates an instructing image including an image of information identifying the document, an image of the manner, and an image of a first entry column on which an information indicating that a manner of an actual document is different from the stored manner is entered; an output unit that outputs the instructing image; a receiving unit that receives a read-instructing image corresponding to the instructing image, the read-instructing image being read by an image reading device; an extracting unit that extracts first information entered on a second entry column provided in the read-instructing image and second information identifying the document; and a storage that correlates the first information and the second information, and that stores the correlated information.