PURPOSE: Channel localization method and device using the same for solving a ripple effect issue in a single small area WiFi network are provided to present a Markov chain model capable of verifying performance of a ripple effect issue which interference of a channel spreads to a neighbor node. CONSTITUTION: A channel allocation request of a node in a WiFi access point (WAP) is received (S51). Interference intensity and collision value with the other adjacent WAP are measured. A channel is allocated to the node based on the interference intensity and collision value with the other adjacent WAP in the WAP (S56). When nodes or WAPs are crowded in a restricted area in a WiFi network, a ripple effect issue which channel interference between the WAP and the other WAP spreads to a neighbor node is generated. [Reference numerals] (AA) Start; (BB) End; (S51) Request channel allocation; (S52) Channel is valid?; (S53) Reject the channel allocation; (S56) Allocate channels; (S57) Transmit data
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