1. An image forming apparatus for forming an image on a recording medium, comprising: a print unit for printing the image on the recording medium; an instruction unit for giving an instruction to start a printing operation for the each recording medium; and a print control unit for controlling the printing operation to the recording medium according to the instruction to start the printing operation from the instruction unit, wherein, when there is no instruction to start a subsequent printing operation from the instruction unit after the executing of the printing operation to the recording medium according to the instruction to start the printing operation from the instruction unit, the print control unit executes a first post-processing operation for completing the printing operation, and the print control unit determines an operation to be performed after the executing of the first post-processing operation based on whether or not the instruction to start the subsequent printing operation is received during the executing of the first post-processing operation.