A vehicle-mounted apparatus comprising: a communication unit which is connected to the charger/discharger and exchanges information with the charger/discharger; an input unit receiving various types of information; a storage unit which uses the information acquired through the input unit and the communication unit to store: a vehicle ID identifying the vehicle; a charger/discharger ID identifying the charger/discharger which can be connected to the vehicle; and history information indicating a history of charges and discharges for the vehicle, which are related to one another; and a presentation unit presenting to a user of the vehicle, the history information stored in the storage unit in relation to a pair of the vehicle ID and the charger/discharger which charges/discharges the vehicle and is identified by the charger/discharger ID.