1. An apparatus adaptively representing information of depth information of a 3D image, the apparatus comprising: a processor to control each of the following units; a distance section division processing unit to receive the 3D image including a depth value ranging from 0 to a measured limit distance which is a fixed value for specification of camera capturing the 3D image, and divide the measured limit distance into plural sections, wherein the section is an interval having a fixed/uniform step size; a section determination unit to determine which one of plural sections depth values for pixels of the 3D image fall within; and an adaptive quantization unit to generate section information indicating the determined section, and quantize the depth value based on the fixed/uniform step size of the determined section, wherein section information is represented by a fixed number of bits, wherein a step size for the section near 0 is smaller than a step size for the section near the measured limit distance.