In a method and apparatus for measuring an alcohol concentration, a blood alcohol concentration of a driver is rapidly and precisely measured by selecting a plurality of wavelengths based on the absorbance for blood components exerting an influence on the measurement result of the blood alcohol concentration and by measuring the blood alcohol concentration of the driver based on the absorbance detected with respect to a physical body of a user by using the plurality of selected wavelengths. Starting of the vehicle is controlled based on the blood alcohol concentration of the driver, which is measured by measuring the alcohol concentration.
