In absence of a paper feed source matching paper information specified in settings that are input by a user for a job to be executed, permission information associated with the user may not permit use of a manual feed tray as a substitute paper feed source. Upon completion of the job executed in response to selection of a forced execution key, a forced execution determination section determines whether or not an execution number exceeds a predetermined threshold. The execution number indicates how many times a job has been executed in response to selection of the forced execution key. When the execution number exceeds the threshold, a permission information updating section updates the permission information associated with the user so as to permit use of the manual feed tray as the substitute paper feed source.