When printing is to be performed on sheets by switching a plurality of sheet storage units and feeding the sheets, a user confirms, before the designated number of sheets is printed, whether the sheet matches a designated sheet type, and then instructs printing to be continued. Two or more sheet storage units among the plurality of sheet storage units are set as one group, and one sheet is conveyed from each of the two or more sheet storage units set as one group. An image is printed on the conveyed sheets which are then discharged to a sheet discharge unit, and printing is interrupted. If an instruction to continue the interrupted printing is received, control is performed to resume the interrupted printing.