1. A vehicle, comprising: an image capture unit configured to acquire image information by imaging a forward view of the vehicle; an imaging device controller configured to determine whether a traffic sign that indicates speed limit information of a road is recognized abnormally based on the acquired image information; and a navigation controller configured to display either speed limit information of the road stored in a imaging device database or speed limit information of the road stored in a map database in response to determining that the traffic sign is recognized abnormally.