traffic control center 20 divides the service area to be operated on-demand bus 10 to a predetermined plurality of sub-areas, to explore this split route candidate to run the on-demand bus 10 for each sub-area was. Also, center 20, one of the searched route is set to the basic path is set for each sub-area divided as an adjustment time period required when passing through the point spaced from the base path. Thus, by setting the adjusting time for each sub-area, the center 20, by using the adjustment time set for each sub-area, in consideration of the desire has been added to reduce the impact on the determined trip plan it is possible to determine the service plan.
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