The embodiment of the invention discloses a method and a device for processing information. A specific embodiment of the method comprises the following steps: extracting a point data sub-set for describing lane lines from an obtained point data set of a road; projecting the point data in the point data subset to a horizontal plane to obtain an initial lane line image, and determining a corresponding relation between the point data in the point data subset and pixel points in the initial lane line image; processing the initial lane line image to obtain a processed lane line image; and processing the point data subsets on the basis of the corresponding relations and the processed lane line images to obtain processed point data subsets. This embodiment enables processing of point data subsetsused to describe lane lines.