The toy system includes: a pair of motors; an operating device having a throttle lever for velocity direction and a steering device for course direction; a driving control device for controlling driving velocities of the respective motors so that the driving velocity of the pair of motors is varied in association with an operation amount of the throttle lever, and when the steering is operated from a neutral position, a difference occurs between the driving velocities of the pair of motors at a velocity ratio in association with the operation amount of the steering; a setting device for accepting a setting operation of a predetermined parameter by a user. The driving control device changes a correspondence relationship between the operation amount of the steering and the velocity ratio in an interlocking manner with the change of the setting value of the parameter.