An object of the present invention is to provide a technology capable of estimating a waiting time at an energy refilling facility for each of drive types. A center-side system includes a center-side receiver that receives, from a vehicle-side system, probe vehicle position information and drive type information that is information regarding a drive type of a probe vehicle. Then, the center-side system includes: a traffic condition estimation unit that estimates a traffic condition, which includes a drive type-classified number of vehicles, based on the probe vehicle position information and the drive type information, which are received by the center-side receiver; and a center-side transmitter that transmits, to an outside, the traffic condition estimated by the traffic condition estimation unit.