CONTROLLER, CONTROL METHOD, AND BRAKE SYSTEM

The invention obtains a controller and a control method capable of improving safety by an automatic braking operation while preventing a motorcycle from falling over. The invention also obtains a brake system that includes such a controller. In the controller and the control method according to the invention, a control mode that makes the motorcycle execute the automatic braking operation is initiated in response to trigger information generated in accordance with peripheral environment of the motorcycle. In the control mode, distribution of an automatic braking force to a front wheel and a rear wheel is controlled in accordance with travel posture of the motorcycle, and the automatic braking force is a braking force that is applied to the wheels of the motorcycle by the automatic braking operation.