PROBLEM TO BE SOLVED: To provide the improved system and method of a human/machine interface in the field of a user interface.SOLUTION: There is disclosed a three-dimensional human/machine interface (3D HMI) in which the 3D HMI includes: (1) image acquisition assembly (2) start module (3) image division module (4) division data processing module (5) scoring module (6) projection module (7) compatible module (8) scoring and error detection module (9) recovery module (10) three-dimensional correlation module (11) three-dimensional skeleton prediction module (12) output module and (13) depth extraction module.