Simply speaking, military officers were 'government officials (espcially one of low to medium rank) who were armed and a full-time government [public] employee-like officials trained under the Ritsuryo-system,' while the bushi were 'the people who consisted of a 'lower ranking nobles,' 'lower ranking government officials' and 'people from powerful or medieval families' who regarded the new military art established during the 10th century as their iegei and were officially authorized to be armed by the Imperial Court or kokufu (provincial office)' and they did not acquire the military art of the Ritsuryo-system style in the training institution of the organization of the government according to the Ritsuryo codes.
簡単にいえば、武官は「官人として武装しており、律令官制の中で訓練を受けた常勤の公務員的存在」であるのに対して、武士は「10世紀に成立した新式の武芸を家芸とし、武装を朝廷や国府から公認された「下級貴族」、「下級官人」、「有力者の家人中世の家人」からなる人々」であって、律令官制の訓練機構で律令制式の武芸を身につけた者ではなかった。