Some traditional definitions of information are examined to seek for the mutual concept of them. Mun-hun(文獻, biblio) is defined to clarify its modernized concept. Transformation of library science into Biblio-information science, with the application of information science, are maintained. The results mentioned above are as the followings; 1. The mutual concept of information should be defined as the factor which gives the motivations of certain perception and thinking to the brain of which is the contral center of thinking and behavior of man, and as the factor of knowledge and science. 2. Mun-hun(文獻) means originally "books and wise men". It is elucidated that books mean recorded information, and wise men mean oral information. And so, mun-hun means composite information. 3. It is the inevitable need to investigate the "effective means and methods for the effective use of the best information in a great information flow, and for the recreation of the more advanced information. Biblio information science should be the science to meet the need. 4. Biblio information science should be formed with the application of library science and information science. 5. Biblio information science can be defined as a science to investigate the effective means and methods of selection, processing, ac. cumulation and use of information materials, for the recreation of the more advanced information.