| 摘要 |
A user through a mobile or fixed terminal ( 5 ) informs an agent ( 33 ) hosted by an operator server ( 13 ) of subjects in respect of which content is requested. The agent ( 33 ) searches the internet for relevant content, and determines from a set of user preferences, relating to cost and timing of delivery preferences, a network for use in delivering the content to the terminal. Delivery may be made by a free network, e.g. a WLAN or Bluetooth network, if one is available, or over an expensive network such as a 3G, GSM or GPRS network if the content is requited quickly. If delivery is to be made over a broadcast network ( 11 ), such as a DVB-T network ( 11 ), a signal is sent to the terminal over a mobile telephone network ( 7 ) giving the time of broadcast, in response to which the terminal ( 5 ) enables its broadcast receiver at the appropriate time. Also, the agent ( 33 ) periodically reviews the content on a data carousel ( 45 ) which is awaiting broadcast, and informs the terminal ( 5 ) of any forthcoming content which is relevant to the user request.
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