A printing system includes a first module, a second module, a third module, a system configuration controller, and a display controller. The first module receives job data and controls a printing processing process. The second module converts the job data into image data. The third module converts the image data into data in an appropriate format. The printer receives the data from the third module and performs printing. The system configuration controller is used to share system configuration information among the first, second, and third modules. The display controller displays a state of the printing system and receives an instruction for adding or an instruction for removing at least one of the second and third modules from a user. The system configuration controller executes addition or removal of a certain module in accordance with the addition or removal instruction received by the display controller.