Management device

A management device for a vehicle on-board network system in which devices are connected to each other in a communicable manner, the management device comprising:

• processing circuitry configured to start a target device of the devices, the target device being a device that operates in accordance with a predetermined function to be executed, wherein the processing circuitry is configured to:
• subsequent to modifications made to the vehicle on-board network system, obtain information including:
• a first startup power consumption required when starting the target device, using a first startup method for starting the target device through power control that controls whether to supply power to the target device;
• and
• a second startup power consumption required when starting the target device, using a second startup method for starting the target device by communicating with the target device to request startup for the target device;
• based on the obtained information, select a startup method for the target device from the first startup method and the second startup method;
• and
• start the target device using the selected startup method.