A purpose of this study is to analyze notes on bulletin board systems (BBS) in which people have an active interaction about depression. Entries and first responses written in BBS A, B and C, which were searched by search engine, were subjects. Entries and first responses on BBS A were analyzed by Grounded Theory Approach, and 15 categories are abstracted in entries, and 14 categories are in first responses. Then, entries and first responses on BBS B and C were classified with abstracted categories. As a result, in entries, it is common to all BBS to want to talk about their problems and to communicate, and in first responses, it is common to want to help others and to want to talk about themselves. On BBS A, they express pain which they can't in daily life, and create an atmosphere which is easy to write. On BBS B, clear questions, appeals, and difficulty of invite because of little responses. On BBS C, exchanges for some time and conscience of companion.