To easily distinguish printing results of an interrupted job and an interrupting job without printing a marking page at the time of executing interruption printing concerning a plurality of printing jobs.

This apparatus comprises a job detection means for detecting existence or absence of a prior job and obtaining job information, a controlling means for executing interruption printing of a subsequent job, a memory means for storing information for specifying the printing completion page of the prior job, and an outputting means for outputting the information for the printing completion page of the interrupted prior job.