Disclosed herein is a traffic lane correcting method which includes the steps of receiving first lane information detected by a lane departure warning system; comparing the received first lane information with previously-stored second lane information and checking a lane change as time elapses; sensing an error detection of the received first lane information according to the degree of the lane change; correcting the received first lane information when the error detection of the first lane information; and transmitting the corrected lane information to the lane departure warning system. The traffic lane correction system and method can solve the problem of erroneous detection which is instantaneously increased in conditions that the traffic lane is worn out or that there are lots of complex noises, thus enhancing reliability of the lane departure warning system and increasing user convenience. [Reference numerals] (310) Lane information transmitting and receiving unit; (320) Reference lane information generating unit; (330) Lane property generating unit; (340) Lane error-detection sensing unit; (350) Lane information correcting unit
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