1. A computerized data equidistant-mapping method used by a computer system for mapping M sets of K-dimensional original data into a D-dimensional space in a manner of equidistance, the computerized data equidistant-mapping method comprising: (a) generating the M sets of D-dimensional mapping data by the computer system, wherein each mapping data corresponds to each original data respectively and sequentially; (b) arbitrarily choosing an initial mapping data and an initial original data by the computer system from the mapping data and the original data respectively, wherein the initial mapping data corresponds to the initial original data; (c) computing each mapping distance between each mapping data and the initial mapping data, and computing each original distance between each original data and the initial original data by the computer system; and (d) amending each mapping data according to each mapping distance and each original distance by the computer system for enabling each mapping data and each original data to have equidistant-mapping relationship gradually; wherein the step (d) comprises: (d11) amending the mapping data in a direction towards the initial mapping data when the mapping distance is larger than the original distance; (d12) amending the mapping data in a direction away from the initial mapping data when the mapping distance is smaller than the original distance; and (d13) not amending the mapping data when the mapping data is equal to the original data.