IN-VEHICLE APPARATUS, INFORMATION PROCESSING METHOD, AND PROGRAM

An in-vehicle apparatus according to the present disclosure is an in-vehicle apparatus that is mounted in a vehicle and connected to another in-vehicle apparatus to be capable of communicating with the other in-vehicle apparatus via an in-vehicle network, the in-vehicle apparatus including: a control unit that controls communication with the other in-vehicle apparatus. When the control unit causes the in-vehicle apparatus to transition from a normal state to a sleep state, the control unit generates a notification message that is defined by AUTOSAR by including, in the notification message, a deactivation flag for causing the other in-vehicle apparatus to deactivate disconnection detection, and outputs the generated notification message.