The purpose of this study is to evaluate the personnel data of the candidates for promotion of naval officers based on efficiency. In addition, the inefficiency of the inefficient candidates and the goals to be improved are derived. The input and output variables to evaluate the personnel data were selected, the mathematical model was constructed, and the personnel data evaluated using the DEA. Based on the efficiency score and the number of benchmark, the ranking of personnel data was determined and compared with the current method. The goal is to improve efficiency by measuring the inefficiencies of each decision making unit through benchmark group.