| 摘要 |
<p>There is provided a selective communication system of communications satellite / terrestrial lines in which three types of terminals of terrestrial terminals having interface only for terrestrial system, satellite terminals having interface only for terrestrial system and satellite / terrestrial terminals having both interfaces for satellite system and terrestrial system are available and allows a group broadcast communication and selection of transmission route for broadcast communication in consideration of not only transmission time but also communication cost and the quality of lines. The system has a structure including above three kinds of terminals, and selects and changes transmission route based on destination included in the output signal, identifying information whether it is broadcast communication or one-to-one communication, and predetermined judgment condition for transmission route when data are transmitted from switchboard to these terminals. <IMAGE></p> |
