Multicasting functional equipped information on demand system

摘要

(57) Abstract This invention offers the information service system, the management tools which output the transmission control data which includes the information of the channel of the information data where this information service system, is jointed by routing means and the above-mentioned routing means, is jointed by the storage device and the above-mentioned routing means which store the information data, possesses entry means and indicatory means, is jointed by the multiple terminal units and the above-mentioned routing means which output the demand data which requires the information data which is chosen respectively, manages the transmission of the above-mentioned information data, receives the demand data from the above-mentioned terminal unit, is chosen havingThe information data which is chosen on the basis of the distribution control data, with routing information it outputs the above-mentioned storage device, with packet format of 1 or more, the above-mentioned routing means have the table where the data which shows the relation between routing information of the above-mentioned storage device and routing information of the above-mentioned terminal unit is stored, at least the terminal unit of one or more requires the same information data when on the basis of the above-mentioned data, routing information from the above-mentioned storage device, displacement to the routing information for the terminal unit in the above-mentioned routing means.