Driving support devices, methods, and programs determine a target position ahead of a vehicle and a target vehicle speed at the target position. The devices, methods, and programs divide a section between a deceleration start position to start deceleration of the vehicle and the target position into a plurality of sections and set target charging electric power to different values for respective sections forming the plurality of sections to reduce a speed of the vehicle to the target vehicle speed at the target position. The devices, methods, and programs control an electric generator installed in the vehicle to generate the regeneration brake in the respective sections forming the plurality of sections based on the set charging electric power values and charge the battery with the target charging electric power generated in each of the respective sections.