| 摘要 |
The determining section (33) defines as, calculation positional information, positional information calculated based on a speed of a vehicle (10, 10A) obtained by a speed obtaining section (32) and a period of time corresponding to an obtainment interval of positional information. The determining section (33) determines whether the positional information of the vehicle (10, 10A) obtained from a positional information obtaining section (31) is abnormal based on a comparison between the calculation positional information and the positional information. |
