Server device, system, and operation method of system

A system comprising:

• a server device;
• and
• a power-feed-receiving vehicle that communicates with the server device, wherein
• based on information regarding a remaining charge in a battery of the power-feed-receiving vehicle, and information regarding a travel route, the server device sends, to the power-feed-receiving vehicle, either one or both of first information indicating a power feed facility near the travel route, and second information indicating a rendezvous point at which rendezvousing of the power-feed-receiving vehicle with a power-feeding vehicle is attainable, and
• wherein the server device:
• determines a range that is travelable by the power-feed-receiving vehicle from a current position of the power-feed-receiving vehicle using the remaining charge,
• derives a plurality of rendezvous points within the travelable range,
• acquires a state of charge (SOC) of a battery of a plurality of power-feeding vehicles,
• selects, for each rendezvous point, a corresponding power-feeding vehicle on condition that the SOC of the battery is 50% or higher, and
• ranks the plurality of the rendezvous points in order of how small a difference is between a time at which the power-feed-receiving vehicle arrives and a time at which the corresponding power-feeding vehicle arrives.

A server device comprising:

• one or more communication interfaces;
• and
• one or more processors that perform communication by the one or more communication interfaces, wherein,
• based on information regarding a remaining charge in a battery of a power-feed-receiving vehicle, and information regarding a travel route, the one or more processors send, to the power-feed-receiving vehicle, either one or both of first information indicating a power feed facility near the travel route, and second information indicating a rendezvous point at which rendezvousing of the power-feed-receiving vehicle with a power-feeding vehicle is attainable,
• wherein the one or more processors are configured to:
• determine a range that is travelable by the power-feed-receiving vehicle from a current position of the power-feed-receiving vehicle using the remaining charge,
• determine whether a number of power feed facilities within the range is larger than a threshold,
• in a case where the number of power feed facilities within the range is equal to or less than the threshold, send the second information, and
• in a case where the number of power feed facilities within the range is larger than the threshold, not send the second information, and
• wherein the threshold is between 3 to 5.