1. An electronic message system in which a plurality of users can post messages and the user can refer to the posted messages, comprising: a client for transmitting a message including at least a text of the message; and a server for receiving the message transmitted from said client through a network, wherein said server comprises a database for posting a message, related information holding means for holding information for related subject between the message posted in said database and other posted message, and summary forming means for, in a case where the message transmitted from said client is a message according to the message posted in said database, registering a quotation sentence which cites said posted message into said database together with said message thus transmitted and for forming a summary by merging a series of related messages on a basis of said information for related subject.
1. An electronic message system in which a plurality of users can post messages and the user can refer to the posted messages, comprising: a client for transmitting a message including at least a text of the message; and a server for receiving the message transmitted from said client through a network, wherein said server comprises a database for posting a message, related information holding means for holding information for related subject between the message posted in said database and other posted message, and summary forming means for, in a case where the message transmitted from said client is a message according to the message posted in said database, registering a quotation sentence which cites said posted message into said database together with said message thus transmitted and for forming a summary by merging a series of related messages on a basis of said information for related subject. 4. A system according to claim 1, wherein when the message is posted, said server adds an identification code to the quotation sentence which cites said posted message and posts the message into said database.