Abstract
Z39.50 is the international standard of an information-retrieval protocol, and can offer the history-reference search function, the environment independent from a specific vender, the crossing reference function with unified interface, etc. In the result of the questionnaire and interview to the university library which is the user of Z39.50 and is an information addresser, it is observed as choice of the technical element in the information disclosure, in spite of the very low domestic popularization level. Although many problems remain in the present condition, it is important not to judge Z39.50 from the viewpoint of only the advantage in the present condition, but to judge on the basis of the future possibility.
