Start-up proposal device and start-up proposal method

A commissioning proposal device mounted on a vehicle (A) together with a driving support device (70) for assisting a driver's driving or taking over a wheel and proposing to the driver start up the driving support device comprises: a state value detecting unit (FIG. 31) that detects a condition value indicating a driving condition of the vehicle; a preference value detection unit that acquires a preference value that reflects the driving condition that is preferred by the driver; and a commissioning proposal unit (36) which proposes to start up the driving support apparatus in accordance with a comparison between the state value and the preference value.