1. An electronic device with three-dimensional image creating function, the electronic device comprising: a plurality of image capturing units, each image unit to capture an object located in one corresponding direction of a three-dimensional scene with different focal length and capture a plurality of images of the object in each direction; an outline detecting unit to detect an outline of the object in each captured image; a coordinate determining unit to determine three-dimensional coordinates of each point of the detected outline; and an image synthesizing unit configured to: synthesize the detected outlines of objects from the captured images captured in the same direction together according to the three-dimensional coordinates of the outlines; create a three-dimensional image along each direction with the corresponding synthesized outlines, and stitch the three-dimensional images of different directions together to obtain a combined image of the three-dimensional scene.