A learning method of a CNN capable of detecting one or more lanes using a lane model is provided. The method includes steps of: a learning device (a) acquiring information on the lanes from at least one image data set, wherein the information on the lanes are represented by respective sets of coordinates of pixels on the lanes; (b) calculating one or more function parameters of a lane modeling function of each of the lanes by using the coordinates of the pixels on the lanes; and (c) performing processes of classifying the function parameters into K cluster groups by using a clustering algorithm, assigning each of one or more cluster IDs to each of the cluster groups, and generating a cluster ID GT vector representing GT information on probabilities of being the cluster IDs corresponding to types of the lanes.