COMMUNICATION SYSTEM, TRANSMISSION TERMINAL USED FOR COMMUNICATION SYSTEM, RELAY TERMINAL USED FOR COMMUNICATION SYSTEM, COMMUNICATION METHOD IN COMMUNICATION SYSTEM AND COMPUTER PROGRAM USED FOR COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To enable a publication-side terminal to transmit information while designating a desired subscription-side terminal in a system for performing data distribution services (DDS)-based communications. SOLUTION: Each of relay terminals 2-4 includes a table 15 for storing therein one of a plurality of priorities ranked among the relay terminals 2-4 and a means for transmitting and receiving control information required for performance of communication procedures determined by DDS between a transmitting terminal 5 and a receiving terminal 1. The transmitting terminal includes a means for transmitting and receiving the control information to/from each of the relay terminals 2-4, a storage section 17 for storing address information of the relay terminals 2-4, respectively, and a table 18 for storing therein priorities of the relay terminals 2-4 read from the respective tables 15 of the relay terminals 2-4 by the transmitting and receiving means. The transmitting terminal 5 selects any one relay terminal 2 based on the priorities in the table 18 and transmits information to the relay terminal 2, and the relay terminal 2 transmits the information to the receiving terminal 1. COPYRIGHT: (C)2009,JPO&INPIT