Method and apparatus for charging auxiliary battery of vehicle including driving motor

The present invention relates to a method and an apparatus for charging an auxiliary battery of a vehicle including a driving motor. According to an exemplary embodiment of the present invention, an apparatus for charging an auxiliary battery of a vehicle including a driving motor, includes: a driving distance detector detecting a driving distance of the vehicle; a timer detecting time lapsing from a specific time; a main battery SOC detector detecting a state of charge (SOC) of a main battery; an auxiliary battery SOC detector detecting an SOC of the auxiliary battery; and a controller operated by a program set to control an operation of a DC converter based on signals of the driving distance detector, the timer, the main battery SOC detector, and the auxiliary battery SOC detector.