A bicycle controller and a bicycle controlling method reduces a distance a bicycle travels before a motor is stopped regardless of whether pedaling is stopped in a state where a rotation speed of the crank is high. The bicycle controller includes an electronic control unit that controls a motor, which assists pedaling of a bicycle, based on a manual driving force and angle information related to an angle of a crank of the bicycle. If the crank is rotated by a predetermined angle or greater in a state where the manual driving force is less than or equal to a predetermined threshold value while the motor is driven, then the electronic control unit stops the motor.