PURPOSE: An efficient frequency sharing system of WRAN and WLAN using spectrum etiquette and genetic algorithm in TV white space and a method thereof are provided to reduce mutual interference according to co-existence of various heterogeneous communication devices like the WRAN and the WLAN. CONSTITUTION: An information acquisition unit (110) acquires information of WRAN and WLAN. An optimum resource allocation unit (120) allocates optimum frequency sub-band on the basis of the information collected from the information acquisition unit. A broadcasting unit (130) broadcasts the optimum frequency sub-band to each corresponding system. TV white space (TVWS) is idle frequency resource of TV broadcasting frequency band, and is frequency channel space which can be used without additional authorization. The information acquired by the information acquisition unit corresponds to setting state of a peripheral device, channel allocation state, installation position, access mode method and the number of access points (AP). [Reference numerals] (110) Information acquisition unit; (120) Optimum resource allocation unit; (121) First channel selection unit; (122) Second channel selection unit; (130) Broadcasting unit
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