A printing system adapted to supply printed materials from a printing apparatus to a first stacking unit of a first sheet processing apparatus and a second stacking unit of a second sheet processing apparatus is provided. The system includes a receiver and controller, the receiver receiving via a user interface unit a specified instruction allowing the printing system to perform a first type operation that both the first stacking unit and the second stacking unit can be used in printing a job to be processed, the controller causing the printing apparatus to perform the first type operation wherein the specified instruction is received, and the controller causing the printing apparatus to perform a second type operation wherein the specified instruction is not received, the second type operation wherein one of the first stacking unit and the second stacking unit can be used in printing a job to be processed.