Data transmission/reception apparatus for use in a two-way digital broadcasting system

摘要

The reception device in two-way digital broadcasting system sends a transmission request for an object via a control channel of a network to a server device that stores a plurality of objects. This plurality of objects includes at least one object that contains data and at least one object that contains a control instruction for a synchronous transmission request requesting the transmission of data that is presently required or an asynchronous transmission request requesting the transmission of data that will probably be necessary in the future. The reception device receives the requested object via the data channel of the network. On receiving an object that includes a control instruction for a synchronous transmission request or an asynchronous transmission request from the server device, the reception device decodes the control instruction in the received object and judges whether a synchronous transmission request or an asynchronous transmission request is to be issued. When a synchronous transmission request is issued, the reception device does not decode another instruction until the requested object arrives. On the other hand, when an asynchronous transmission request is issued, the reception device does not wait for the requested object to arrive before decoding another instruction.