Disclosed is a virtual desktop service method. The virtual desktop service method includes configuring and measuring users and resources according to predetermined criteria, copying operating system files and data files to be provided to the users before use request, receiving request to use a virtual machine from any one of the users and performing user authentication and work approval, and providing an operating system file and a data file of the any one of the users, among the copied operating system files and data files, to the any one of the users according to the use request to transmit a virtual desktop environment. Consequently, the virtual desktop service method performs a service to provide a virtual machine to a user in real time.