On-board update device and on-board update system

An on-board update system which comprises:

• a plurality of communication devices installed in a vehicle, and
• an on-board update device comprising:
• an update processing unit configured to update a program or data stored in a storage unit of each communication device,
• an update information acquisition unit configured to acquire an update program or data from a device outside the vehicle;
• a required electric power estimation unit configured to estimate an amount of electric power required for an update process using the update program or data acquired by the update information acquisition unit;
• and
• a battery level acquisition unit configured to acquire an amount of electric power charged in a battery of the vehicle,
• wherein the update processing unit is configured to perform an update process in consideration of the amount of electric power estimated by the required electric power estimation unit, the amount of electric power acquired by the battery level acquisition unit, and a priority level of the update program or data acquired by the update information acquisition unit, and
• wherein each of the communication devices is configured to receive the update program or data from the on-board update device, and to perform an update by storing the received update program or data in the storage unit.