In an image forming apparatus, a page data generation unit is configured to generate page data of a job list screen that includes a link to the page data of a detailed information screen on an uncompleted job. An access control automaton generation unit generates an access control automaton from an access control policy; a schema automaton generation unit generates a schema automaton from a schema; and a logic operation unit performs a logic operation related to each of the generated automatons. A determination is made whether the inline parameter would result in a value of a device operation parameter within a predetermined range. The speech signal having a pitch fluctuation can be compressed in high quality and high efficiency by coding or synthesizing the speech wave signal using the pitch wave signal creation method of the invention.