DRIVING SUPPORT DEVICE

The driving support device includes; a support controller; a storage device configured to store a definition of at least one prerequisite control; and a system controller configured to perform the at least one prerequisite control, wherein the support controller includes; acquiring information of a prerequisite control and a system state corresponding to the driving support control in response to an operation of a driver of a vehicle for starting the driving support control; determining whether the system state is enabled or disabled for each prerequisite control corresponding to the driving support control; requesting the driver to approve a change of the system state for the prerequisite control related to the system state determined not to match; and in response to obtaining approval from the driver, changing a system state of the prerequisite control related to the system state determined not to match and starting the driving support control.