Abstract: A focus control apparatus controls a step motor and a piezoelectric material into order to control a focal distance between an electronic imaging device and a lens unit. The focus control apparatus has an image calculating unit for processing an image signal taken by the electronic imaging device into a resolution value, a displacement controlling unit receiving the resolution value in order to determine an optimal focal distance between the electronic imaging device and the lens unit and output a displacement controlling signal, a step motor controller and a piezoelectric material controller. The displacement controlling signal is supplied to the step motor controller or the piezoelectric material controller to control optimally the distance between an electronic imaging device and a lens unit.