Patent ID: 7925425

Claim:
An information distribution center for use with a navigation apparatus, the navigation apparatus including a communication device that transfers a piece of vehicle position information to the information distribution center, the piece of vehicle information including a vehicle position and a time when the vehicle passes through the vehicle position, the information distribution center comprising: a communication device that receives pieces of vehicle position information and traffic information including congestion information and distributes a calculated congested section travel time; a memory that stores the received pieces of vehicle position information in order of arrival; and a controller that: specifies a congested section based on the congestion information; weights a first travel distance within the congested section according to the congestion information about the congested section, the first travel distance calculated based on two of the received pieces of vehicle position information received from the navigation apparatus and the congestion information about the congested section; calculates a first travel time corresponding to the first travel distance; and calculates the congested section travel time necessary for passing through the congested section based on the calculated first travel time.