CONTROL DEVICE AND CONTROL METHOD FOR BEHAVIOR OF A LEAN VEHICLE

The present invention provides a controller and a control method that assist a rider in driving a leaning vehicle.A controller (20) maneuvers a leaning vehicle (100). The controller has an acquisition unit (21) and an execution unit (22). The acquisition unit acquires, while the leaning vehicle (100) travels, a surrounding environment information that is information about an environment surrounding the leaning vehicle (100). The execution unit (22) causes the leaning vehicle (100) to execute an automatic acceleration and deceleration operation based on the surrounding environment information acquired by the acquisition unit (21). When a group ride mode in which the leaning vehicle (100) travels together with a plurality of other leaning vehicles (200A) in a group is operable, the execution unit (22) causes the leaning vehicle (100) to execute, as the automatic acceleration and deceleration operation, a positional relationship adjustment control with respect to a virtual moving object that represents a plurality of peripheral vehicles (200) near the leaning vehicle (100).