A print control apparatus of a printing system, which performs overlay printing using a pre-created form, lets a user designate a field in the form for data to be inserted into the field in the overlay printing. In executing overlay printing of plural pages, the data to be inserted into the designated field is analyzed to determine whether or not one same data is repetitive. In a case where it is determined that the one same data is repetitive, the form is not created, but in a case where it is determined that the one same data is not repetitive, the form including the data is created.