Patent ID: 6954797

Claim:
A data communication method for transmitting/receiving desired data between a terminal equipment and at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, said method comprising the steps of: preparing a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication; and exchanging said message between said terminal equipment and said interconnecting installation to transmit and receive the desired data, wherein said header is formatted such that said message comprises a message selected from the group consisting of: a passive opening message for requesting a passive opening of said connection; an active opening message for requesting an active opening of said connection; an establishment message for notifying connection establishment for said connection passive opening request or said connection active opening request made in the past; a close message for requesting close of said connection; and a reply message which is reply notification to said received message, and wherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.