Abstract: A method for asymmetrically duplicating and distributing data stream, which is executed in a device having one or more network adapters, each network adapter is configured with a network address, the method comprising steps of: establishing at least one LIP according to system configuration or a user's request; establishing at least one LOP according to the system configuration or the user's request; establishing a mapping relation between the at least one LIP and the at least one LOP according to the system configuration or the user's request; multi-duplicating each of the data streams received from the at least one LIP according to the mapping relation; and transmitting the multi-duplicated data streams to one or more users via the one or more LOPs corresponding to the LIP.