An image processing apparatus includes first and second sheet storage units and a post-processing unit to perform specific post-processing on a printed sheet. A print command is received in which a sheet in the first sheet storage unit is specified as a sheet to be used in printing a first copy and a sheet in the second sheet storage unit is specified as a sheet to he used in printing a second copy. In a case where the specific post-processing is unable to he performed on the sheet to be used in printing the first copy, a printed sheet is output without causing the post-processing unit to perform the specific post-processing on the sheets for the first and second copies, even if the print command commands that the specific post-processing be performed in printing the first copy and the second copy.