The invention provides a navigation method and device. The method comprises the following steps: obtaining the present start point and terminal point of a user, according to the start point and terminal point, generating a planned route; obtaining the parameters of a present vehicle of the user and the parameters of each lane in the planned route, determining the drivable lanes for the user; determining the lane changing points on the drivable lanes, wherein the lane changing points at least comprise front lane number changing points and branch points of intersections; in each lane changing point before the terminal point, generating an optimal route from a current lane to a front lane, and showing each optimal lane to the user. The route guiding reaches the lane level, more real and safer information is provided for a user; moreover, in the intersection, detailed lane guiding information is provided, thus a user can rapidly and safely pass the intersection; due to precise lane data, more safety guarantees are provided for a user, and the accidents are reduced.