The annoyance which is written to the bulletin board entry. Besides the fact that it is contributedwith profit-makingpurpose (the annoyance mail) with similarly, as a part of announcement activity, the harassment there are also times when it is contributed as purpose.

Because contents of the communication which is done with the bulletin board the announcement which does not have relationship is contributed, when doing communication, besides the fact that it becomes obstacle, when BBS SPAM is contributed to brief in large quantities, offer of bulletin board service ? are also times when it is harmed. In addition, contents of announcement become problem e.g., from the fact that it is contributed to the public place which anyone can peruse, announcement of obscene contents touches the eye of the child. Not only contribution of mere announcement,because there are alsotimes when link to the Web sight which does one click fraud and the like is included, note is necessary in link of the contribution which is thought as BBS SPAM.