1. An in-vehicle head unit capable of performing an outgoing call through voice recognition, in which the in-vehicle head unit communicates with a user device, the in-vehicle head unit comprising: a Bluetooth module configured to connect Bluetooth communication with the user device when a vehicle is powered on; a memory configured to store programs for operating controller and retain voice recognition database for Bluetooth hands-free communication; and a controller configured to check whether an existing voice recognition database is present and download phone book information from the user device through the connected Bluetooth communication, wherein the controller is further configured to perform the voice recognition for the outgoing call using the dummy voice recognition database if the existing voice recognition database is not present in the memory, and to perform the voice recognition for the outgoing call using the existing voice recognition database during the download the phone book information if the existing voice recognition database is present in the memory.