A vehicle device receives image data transmitted from a compartment camera photographing a driver. The vehicle device analyzes the image data received from the compartment camera, and detects a heart rate of the driver. The vehicle device wirelessly communicates with one or more wearable devices possessed by one or more people who ride on a vehicle. The vehicle device identifies a wearable device possessed by the driver by comparing biometric information transmitted from the one or more wearable devices with the heart rate of the driver.