Wireless link method and system using multi-band

A wireless link system using a multiband includes: a common baseband module to operate in a first frequency band and a second frequency band higher than the first frequency band; at least one low RF module to process a signal outputted from the common baseband module in the first frequency band; at least one high RF module to process a signal outputted from the common baseband module in the second frequency band; a plurality of antennas electrically connected to the at least one low RF module and the at least one high RF module; and a control unit to adaptively allocate a control signal and data to the at least one low RF module and the at least one high RF module, based on state information of a wireless channel.