Patent ID: 8306742

Claim:
A navigation server which supports guiding by a navigation device, on the basis of communication with the navigation device, comprising: a road traffic information storing unit which stores a standard changing pattern at a first position in a target road section of a value of a first traffic state variable, the value of which changes with existence or nonexistence of a traffic jam and a level thereof, and a second traffic state variable which is a time function, as a second road traffic information; a first support processing unit which recognizes the value of the first traffic state variable in the target road section at a first time after occurrence of an accidental situation at the target road section as a recognition result, and estimates a changing pattern of the value of the second traffic state variable at a second position in which the accidental situation occurred during a first period commencing at the first time and terminating at a second time, on the basis of the recognition result; a second support processing unit which generates a primary guide support information with respect to a road condition between the first position and the second position during the first period, on the basis of a changing pattern of a value of the second traffic state variable at the first position as the second road traffic information, and a changing pattern of a value of the second traffic state variable at the second position as the estimation result of the first support processing unit; and a third support processing unit which makes the navigation device recognize the primary guide support information generated by the second support processing unit by communicating with the navigation device, or generates a secondary guide support information on the basis of the primary guide support information generated by the second support processing unit and makes the navigation device recognize the secondary guide support information by communicating with the navigation device.