Patent ID: 7376509

Claim:
A travel time calculating method of a navigation device, wherein, said navigation device comprises a storage device which stores map data including link data of respective links constituting roads on a map, and statistical data including a travel time or a moving speed, which are determined by statistical values of traffic information collected in the past, wherein, said statistical data is classified by a collection condition of the traffic information, which is a basis for determining said statistical data, and the navigation device is allowed to execute the following: a departure position/destination setting step which sets a departure position and a destination, a departure time candidate setting step which sets a plurality of departure time candidates, and a travel time calculating step which uses, with respect to each of said departure time candidates, said map data and said statistical data of the collecting conditions corresponding to statuses in passing through respective route constituting links, each constituting a route between said departure position and said destination, obtains travel times for said respective route constituting links, and further obtains a travel time between said departure position and said destination by summing up thus obtained travel times of respective route constituting links, wherein said statistical data includes a travel time or a moving speed by time zone for each of said links, said travel time calculating step calculates said travel time, by using, as the travel time of a first link constituting a route between said departure position and said destination, a travel time corresponding to a time zone including a departure time of said departure position included in said statistical data, or a travel time obtained from the moving speed corresponding to the time zone, and as the travel time of the (n)th route constituting link (n≧2) constituting the route between said departure position and said destination, a travel time corresponding to a time zone including an expected arrival point of time at a termination node of (n−1)th route constituting link, being connected to the (n) th route constituting link, or a travel time obtained from a moving speed corresponding to the time zone.