An interface device, a vehicle having the same, and a method of controlling the same are provided. The interface device includes a port unit to which the external device is connected and is configured to transmit a first current transmitted from the multimedia player to the external device. A regulation unit is configured to regulate external power into a second current and a selection unit is configured to switch the first current transmitted to the port unit to the second current based on a mode of the external device. Merchantability is improved since an electronic device within the vehicle is rapidly charged using a USB port.