Abstract: A file update processing apparatus which enables execution of an intended file processing in accordance with the description contents of a correspondence slip and a generation table without requesting a system engineer to design a file processing program when a general person in charge who understands specific items required for a file in execution of daily operations sets predetermined items in the correspondence slip and the generation table so as to match his own business contents. When an original book registration slip, a journalizing table, and an expansion table are input from an input unit, an input processor registers them in correspondence with data files. A file processor generates a record on the basis of items set in the original book registration slip and items generated on the basis of the generation tables and updates the data file on the basis of this record.