The purpose of this study is to analyze the changing trends in the in-service teacher education of U.S.A., England, Germany, France, and Japan. To achieve the purpose, the realities of the countries' in-service teacher education was scrutinized. The findings are as follows: Firstly, five common characteristics of the in-service teacher education were derived; 1) Each country is much interested in and supports the nationwide in-service teacher education. 2) Universities and colleges in the countries have been under the key role for their in-service teacher education. 3) Those countries have a good connecting system between universities and elementary or secondary schools. 4) Usually, teachers participate in the in-service teacher education program voluntarily. 5) In-service teacher education programs are developed in connection with the school-reform policies in those countries. Secondly, the results of the study hint that the following four might be helpful for the development of the in-service teacher education of Korea: 1) We need to have countrywide interests in the in-service teacher education. 2) Universities ought to take a significant role for the in-service teacher education. 3) We need a system linking together universities, elementary schools, and secondary schools for the in-service teacher education. 4) We have to establish policies instigating the teachers' spontaneity for the in-service teacher education program