To fill a gap between a concept of user interfaces as an integrated application and a conventional concept of user interfaces.

When at least any one of an input document button 421, a user document button 422, an output document button 423, a paper document input button 424, an electronic document input button 425, a paper document output button 426 and an electronic document output button 427 is pressed, an application type is determined by a combination of input/output processing corresponding to a content type, and processing by each application is executed according to the determination.