| 摘要 |
<p>When a CPU of a map information distribution center receives travel history data together with an update request for navigation map information, based on the newest version of map information contained in update map information, the CPU retrieves routes that correspond to the "departure point" and the "destination point" of each of the routes traveled in the past that are contained in the received travel history data. A travel information comparison table is produced based on the route information for each of the retrieved routes. The CPU then compares the "post-update map retrieval" and the "pre-update map retrieval" of the travel information comparison table for each entry, selects several cases starting from the superior cases in order of most improved effect, produces "display data" that displays the results, and transmits the results to the navigation apparatus.
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