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In this paper, we present a depth image based rendering technique for 3D data service over T-DMB. 3D service over T-DMB is very attractive because the single user environment of T-DMB is suitable to glassless 3D viewing. However, the bit budget for depth transmission over T-DMB is very limited with 32 Kbps for data service. Depth image based rendering can resolve this problem because the corresponding depth sequence can be compressed effectively. However, depth image based rendering has also some problems such as a large computational cost for generating virtual images and generation of holes by disocclusion. Therefore, we propose the new depth preprocessing method based on adaptive smoothing and the simultaneous method for generating an auto-stereoscopic image. In the proposed depth preprocessing method, the discontinuity preserving smoothing, followed by the adaptive smoothing based on gradient direction, is conducted by generalizing the conduction function of the anisotropic smoothing. As a result, the reduction of both bit rate required for transmission and holes is achieved. Additionally, the simultaneous method for generating an auto-stereoscopic image can resolve problems of limited memory and large computational complexity. Some experiments show that the proposed scheme can be efficiently employed for 3D data service over T-DMB.