Abstract: Provided is a method for installing at high speed and initializing software in a client PC using a cloud server and a client launcher, which is capable of preventing the waste of resources, such as PC storage spaces, by selectively installing only software required for a user in a client PC chiefly used in an organization, such as a school or a company. Furthermore, there is a method for installing at high speed and initializing software in a client PC using a cloud server and a client launcher, in which the system of a client PC can be stably maintained because the client PC is automatically initialized after software installed in the client PC is used.