Cloud server, client terminal, device, method for operating cloud server and method for operating client terminal

PURPOSE: A cloud server, client terminal, and operation method thereof are provided to increase the computing capability of a client terminal through a cloud server and to enable a client terminal to use a device. CONSTITUTION: A communications unit(110) receives a computing service request from a client terminal. A virtual device driver manager(120) searches for a virtual device driver according to the computing service request. A computing service provider(130) provides a computing service to the client terminal by using the virtual device driver. The virtual device driver manager installs the virtual device driver to the computing service provider.