The invention relates to a lane information-based driver assistance method and driver assistance device. According to said method, driver information and/or an action is or are triggered depending on the lane information and the lane information is derived from at least two pieces of information that characterise the lane (10), said information being obtained by means of an on-board sensor system that comprises in particular at least one video sensor. In order to more accurately detect the curve of the lane (10), discrete shape points (1.1, 1.2, 1.3, X
P0 , X
P1 , 1.n) that are assigned to the lane (1) and curve values that are assigned to each shape point are taken from a digital map of the lane (10). The curve of the lane (10) is determined by merging the data obtained from the on-board sensor system of the vehicle (2) with the data taken from the digital map.