Server and information system matching a power-supplying vehicle and a power-receiving vehicle

An information providing system comprising:

• a plurality of vehicles each configured to supply power to and receive power from another vehicle;
• and
• a server configured to communicate with the plurality of vehicles and configured to perform a matching process for setting a power-supplying vehicle and a power-receiving vehicle from the plurality of vehicles and for matching the power-supplying vehicle and the power-receiving vehicle,
• wherein the server matches the power-supplying vehicle and the power-receiving vehicle based on:
• a distance between the power-supplying vehicle and the power-receiving vehicle being less than a threshold value;
• and
• a charge supply for the power-supplying vehicle being higher than a requested amount of charge for the power-receiving vehicle;
• and
• in the matching process, the information providing system being configured to prohibit setting, as the power-supplying vehicle, a vehicle included in the plurality of vehicles and having a power-receiving history that power has been received from the another vehicle,
• the server further comprising a storage unit configured to store information regarding the power-receiving history that the power has been received from the another vehicle for each of the plurality of vehicles, and
• wherein the server is configured to use the information regarding the power-receiving history that the power has been received from the another vehicle, so as to determine whether or not each vehicle is the vehicle having the power-receiving history that the power has been received from the another vehicle,
• wherein the server is configured to provide, to each of the plurality of vehicles, a corresponding matching history flag indicating presence or absence of a history that a vehicle having a power-receiving history that the power has been received from the another vehicle through the matching process,
• wherein the information regarding the power-receiving history includes information of the matching history flag,
• wherein each of the plurality of vehicles is configured to transmit, to the server, a power-receiving history flag indicating presence or absence of a history that a vehicle having the power-receiving history that the power has been received from the another vehicle, and
• wherein the information regarding the power-receiving history includes the power-receiving history flag.