Abstract: The present invention relates to an automatic focusing apparatus for a video camera and the method thereof, and particularly to an automatic focusing apparatus for a video camera of an active type using infrared light and the method thereof. The present invention comprises a light emitting part, a light-receiving part, first and second current-voltage converters, a selector, a filter, an amplifying integrator, a comparing part, a microcomputer, a motor driver, and an infrared LED driver. After the infinitesimal currents, which are position detecting signals of both channels supplied to the light-receiving part, are converted to voltage signals in current-voltage converters, the voltage signals are selected in the selector with time-division to be processed in one channel by a filter, an amplifying integrator, and a comparator, so that the hardware amount is decreased.