An image output apparatus permitting entire access history and operation history regarding managed documents to be able to be grasped. A document security server holds and manages a history of accesses from a client PC to the managed documents as an access history DB. A digital multifunction peripheral identifies, from a job received from the PC, a user who has issued a job request and a managed electronic document to be printed, and executes online process or offline process depending whether an authority for execution of the presently received job has been checked for. An output image history DB is saved when output processing corresponding to the job received from the PC is performed online, whereas a job history DB is save when other output processing is performed. The access history DB, the output image history DB, and the job history DB are merged and displayed.