WE CLAIM:
1. A presentation device comprising:
an estimating unit estimating behavior of a vehicle;
an illuminating unit illuminating a projection pattern onto ground around the vehicle; and
a control unit controlling the illuminating unit to illuminate the projection pattern in accordance with the behavior of the vehicle estimated by the estimating unit.
2. The presentation device according to claim 1, wherein the estimating unit estimates abnormal behavior of the vehicle, on a basis of detected information obtained from an internal sensor detecting the behavior of the vehicle.
3. The presentation device according to claim 1, wherein the estimating unit estimates abnormal behavior of the vehicle, on a basis of detected information obtained from an external sensor detecting conditions around the vehicle.
4. The presentation device according to claim 1, wherein when there is a tendency for abnormal behavior of the vehicle estimated by the estimating unit to get worse, the control unit controls the illuminating unit to change a display mode of a projection pattern in accordance with the tendency.
5. The presentation device according to claim 1, wherein the control unit identifies an area around the vehicle expected to be affected by abnormal behavior of the vehicle, and controls the illuminating unit to illuminate a projection pattern onto ground in the area around the vehicle, the abnormal behavior being estimated by the estimating unit.
6. The presentation device according to claim 5, wherein the control unit further divides the area around the vehicle expected to be affected by the abnormal behavior of the vehicle into a plurality of areas in accordance with a distance from the vehicle, and controls the illuminating unit to illuminate the plurality of areas with different modes of the projection pattern, respectively, such that the different modes of the projection pattern form a gradual pattern.
7. The presentation device according to any one of claims 4 to 6, wherein the display mode of the projection pattern is at least one of a speed of flashing, color, brightness, chroma, intensity, shape, size, addition of character information, and addition of graphic information.

8. The presentation device according to claim 1, wherein when control of the vehicle by a remote control terminal is determined to be impossible by the estimating unit, the control unit makes the illuminating unit to illuminate the projection pattern.
9. The presentation device according to claim 1, wherein the control unit makes the illuminating unit to illuminate a projection pattern corresponding to a state in which the vehicle cannot move in any direction, the state being estimated by the estimating unit.