The present invention obtains a controller and a control method capable of improving safety of a lean vehicle. According to a controller (30) and a control method of the present invention, an execution section of the controller (30) executes a first operation. The first operation is an operation causing the lean vehicle (1) to execute a cruise control based on a positional relationship information that is information about a positional relationship between the lean vehicle (1) and a preceding vehicle preceding the lean vehicle (1). When a specified operation is performed by a rider of the lean vehicle (1) while the first operation is enabled by the rider, the execution section executes a second operation, the second operation is an operation that automatically stops the lean vehicle (1) regardless of the positional relationship information.

The present disclosure obtains a controller and a control method capable of improving safety of a lean vehicle. In a controller (30) and a control method according to the present disclosure, an execution section of the controller (30) executes a first operation as an operation that causes a lean vehicle (1) to execute a cruise control based on a positional relationship information between the lean vehicle (1) and a preceding vehicle preceding the lean vehicle (1). When a speed information, which is information about a speed of the lean vehicle (1) and is acquired during the first operation, indicates that the lean vehicle (1) is decelerated to a reference speed, the execution section executes, instead of the first operation, a second operation as an operation that causes the lean vehicle (1) to execute the cruise control regardless of the positional relationship information.