| http://www.w3.org/ns/prov#value | - If the channel is changed by a user using the IPTV, information, including the changed channel information and the user ID, is immediately transmitted in operation 307.FIG. 4 is a diagram illustrating a process of recording viewing channel information transmitted by a client, calculating audience ratings, and monitoring audience ratings in real-time according to an embodiment of the present invent
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