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. 9. A system according to claim 1, wherein said summary forming means forms a summary by merging the first message and the last message of said series of messages.