| 摘要 |
An interactive facility is provided on a computer (54) in relation to an MPEG2 transport stream over an internet protocol network (52). The computer is connected through the network to a first internet protocol address identifying a first network socket (80) on a network server (70), from which it receives a first digital single program stream. This is decoded and displayed to the user. If a request for an interactive facility is made by the user, the user is presented on-screen with a menu of possible services. If the user selects one of the possible services and the identification of the selected service is determined, and if the selected service is in another digital program stream, a second internet protocol address is determined, by looking up the service ID in a table stored in the computer and which associates each service ID with an IP address. The computer is then connected through the network to this second internet protocol address identifying the second network socket and receives a second digital program stream, which is decoded and displayed to the user. The second internet protocol address associated with the selected service can be determined by looking up in a table stored in the computer which associates service identifications and internet protocol addresses. The table is updated manually from data included by an added stage (92), at a server (70) in the digital program stream.
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