Shared file issuing and downloading method and file sharing control system

The present invention provides a method for releasing shared file including sending user identification and network connection information of shared user to login server by user terminal in order to request certification, sending user identification and the connection information to management server by login server after certification is passed, feeding back network connection information of management server to user terminal being used to send sharing request information to management server and setting shared file to be under sharing state by management server. A downloading method of shared file is disclosed corresponding to the releasing method. The releasing and downloading methods are put into effect through a controllable file sharing system comprising a login server system, a management server and a user terminal.