| 摘要 |
<p>A CPU specifies factors that are related to the month, the day of the week, and a time period that correspond to a current point in time, based on time data obtained by a timer or the like. The CPU also specifies factors that are related to a mesh ID and a road category of a corresponding one of the links, based on map display data, link data, and the like that are stored in update-purpose map information. The CPU then reads a sample number indicating how many samples are required in order to generate traffic information of the corresponding one of the links, out of sample number data. The CPU thereby sequentially determines the required collected sample numbers for the links. In a case where a center-side traffic information DB stores therein, for each of the links, an equal or larger number of pieces of probe information than the collected sample number indicating how many samples are required in order to generate the traffic information, the CPU generates the traffic information for the link and stores the generated traffic information as part of current traffic information.</p> |
