A route guidance method comprising: calculating a driving route from a current location of a vehicle to a destination; determining whether an intersection or a forked road exists at a predetermined distance from the current location of the vehicle on the calculated driving route; checking, when the intersection or the forked road exists, link information corresponding to a lane in which the vehicle is located, and determining a moving direction toward the intersection or the forked road; and determining an entry route for entering the intersection or the forked road according to the determined moving direction, wherein the determining of the entry route includes: determining whether a lane for the vehicle to run in is to be changed according to the moving direction toward the intersection or the forked road; if the lane for the vehicle to run in is to be changed, determining a traffic flow in a redirection lane in which the vehicle is to run and a lane adjacent to the redirection lane according to the moving direction, wherein the determining the traffic flow includes: dividing respective links corresponding to a plurality of lanes constituting a road into sections; and determining the traffic flow by measuring a traffic volume for each of the divided link sections, wherein the traffic flow of the divided link sections comprises congestion section and non-congestion section; and determining an entry spot of the entry route of the vehicle according to the determined traffic flow. calculating a driving route from a current location of a vehicle to a destination; determining whether an intersection or a forked road exists at a predetermined distance from the current location of the vehicle on the calculated driving route; checking, when the intersection or the forked road exists, link information corresponding to a lane in which the vehicle is located, and determining a moving direction toward the intersection or the forked road; and determining an entry route for entering the intersection or the forked road according to the determined moving direction, wherein the determining of the entry route includes: determining whether a lane for the vehicle to run in is to be changed according to the moving direction toward the intersection or the forked road; if the lane for the vehicle to run in is to be changed, determining a traffic flow in a redirection lane in which the vehicle is to run and a lane adjacent to the redirection lane according to the moving direction, wherein the determining the traffic flow includes: dividing respective links corresponding to a plurality of lanes constituting a road into sections; and determining the traffic flow by measuring a traffic volume for each of the divided link sections, wherein the traffic flow of the divided link sections comprises congestion section and non-congestion section; and determining an entry spot of the entry route of the vehicle according to the determined traffic flow. determining whether a lane for the vehicle to run in is to be changed according to the moving direction toward the intersection or the forked road; if the lane for the vehicle to run in is to be changed, determining a traffic flow in a redirection lane in which the vehicle is to run and a lane adjacent to the redirection lane according to the moving direction, wherein the determining the traffic flow includes: dividing respective links corresponding to a plurality of lanes constituting a road into sections; and determining the traffic flow by measuring a traffic volume for each of the divided link sections, wherein the traffic flow of the divided link sections comprises congestion section and non-congestion section; and dividing respective links corresponding to a plurality of lanes constituting a road into sections; and determining the traffic flow by measuring a traffic volume for each of the divided link sections, wherein the traffic flow of the divided link sections comprises congestion section and non-congestion section; and determining an entry spot of the entry route of the vehicle according to the determined traffic flow.