Drunk driving prevention system and method therefor

A system for preventing drunk driving of a vehicle, comprising:

• a breath test device configured to detect carbon dioxide and alcohol content in a driver's breath when the driver performs breath authentication;
• an alcohol detection unit configured to detect the driver's inebriation through the breath test device;
• a computation unit configured, when the alcohol detection unit detects that the driver is in a drunk state, to compute a driving-possible time at which the driver's drunk state is resolved in the future so that driving is possible for the driver;
• and
• a notification unit configured to output the driving-possible time or whether driving is possible for the driver through an infotainment system of the vehicle or the driver's terminal,
• wherein the notification unit is configured to set the driving-possible time based on location information of the driver detected through a function of a GPS provided in the driver's terminal.