Patent ID: 8068973

Claim:
A car navigation system for receiving information provided by a traffic information providing system, wherein the traffic information providing system comprises: travel information acquiring means for externally acquiring traffic information including information about a travel time of each of links making up a road on a map; storage means for storing the traffic information acquired by the traffic information acquiring means; link travel-time probability calculating means for calculating a probability distribution of travel times of the links with use of a past traffic information stored by the storage means; route travel-time probability calculating means for calculating a probability distribution of travel times of a specific route making up a plurality of links with use of the probability distribution calculated by the link travel-time probability calculating means; setting means for setting a travel time range or a travel time probability for the specific route; and when the travel time range of the specific route is set by the setting means, reliability calculating means for calculating a probability that the travel time of the specific route is in the travel time range set by the setting means with use of the probability distribution of travel times of the specific route and, when the travel time probability of the specific route is set by the setting means, for calculating a travel time range in which the travel time of the specific route falls in the travel time probability set by the setting means with use of the probability distribution of travel times of the specific route; wherein the car navigation system comprises: means for acquiring information about the probability that the travel time of the specific route is in the travel time range set by the setting means or the travel time range in which the travel time of the specific route falls in the travel time probability set by the setting means; and means for displaying the acquired information about the probability that the travel time of the specific route is in the travel time range or the travel time range in which the travel time of the specific route falls in the travel time probability.