A bookbinding processing apparatus capable of setting values for each item of post-processing functions on printed sheets and a control method thereof display, on a display unit, an operation screen for inputting setting values for each item of post-processing functions, and an setting value for each item is input using the operation screen. When inputting a setting value for a first item, giving the instruction to display an recommended setting value for the first item and items thereafter causes a display unit to display a list of recommended setting values for the first item input on the operation screen and for the other items, recommended setting values selected on the list are displayed, and setting values for items previously input on that setting screen can be validated and printing is started.