We have designed and implemented a "Virtual Laboratory" on computer systems. Some of the implemented systems are Web-based learning environments where the client server model and Java technologies are used. The subject of electronic circuits is the most essential one in departments of electrical and electronic engineering. However, it is a subject whose basic theory, and also its technical terms and electronic circuit designs, are difficult for students to understand. In this paper, we describe a study support system for electronic circuits with observable V-I characteristics using Java. (C) 2010 Wiley Periodicals, Inc. Electron Comm Jpn, 93(7): 61-69, 2010; Published online in Wiley Inter Science (www.interscience.wiley.com). DOI 10.1002/ecj.10172