1. An image processing apparatus comprising: a character recognition section that executes character recognition on an input document image and outputs a character recognition result; an item name extraction section that extracts a character string relevant to an item name of an information item from the character recognition result; an item value extraction section that extracts a character string of an item value corresponding to the item name from the vicinity of the character string relevant to the item name in the document image; and an extraction information creation section that creates extraction information by associating the character string of the item value extracted by the item value extraction section to the item name.