An auto-focusing camera module includes a lens module, an image sensor, a color separation unit, a main processor unit, an image processing unit and an OIS unit. The lens module captures an image of object. The image sensor senses the image captured by the lens module. The color separation unit separates the image into red, green and blue colors. The main processor unit calculates MTF values of the image and determines a shooting mode of the auto-focusing camera. The image processing unit processes the image according to the MTF values to compensate for blurring of the image caused by being out of focus. The driving unit drives the lens module to focus the image on the image sensor according to MTF values. The OIS unit detects shaking before shooting and drives the lens module to compensate for the detected shaking.