The book management system is designed with a graphical interface, which is not a part of the operating system software. The graphic interface design of the book management system is an application software running on the operating system. Operating system is a kind of underlying software, which is mainly responsible for managing computer hardware and other software, and providing the necessary running environment for application software. Application software is software running on the operating system, which is used to complete specific tasks, such as book management system, office software, etc. Therefore, the graphic interface design of library management system belongs to the category of application software, not operating system software.