Patent ID: 8132215

Claim:
A broadcast signal receiving apparatus that receives a plurality of transport streams and uses conditional access provided by an external adapter, the broadcast signal receiving apparatus comprising: a pre-processor operable to extract a part of information, by elementary stream unit, from each of the plurality of transport streams by receiving a filtering condition from the external adapter and performing filtering on the plurality of transport streams according to the filtering condition, wherein each elementary stream unit includes a plurality of packets, with each packet having a same packet identifier (PID); a multiplexer operable to multiplex a plurality of parts of information extracted by the pre-processor; an output interface operable to output multiplexed data that is the plurality of parts of information multiplexed by the multiplexer to the external adapter that is located outside the broadcast signal receiving apparatus; an input interface operable to obtain, from the external adapter, the multiplexed data processed by the external adapter; and a demultiplexer operable to demultiplex the multiplexed data obtained by the input interface, wherein the pre-processor is operable to extract a program association table (PAT) and a program map table (PMT), together with the plurality of parts of information by elementary stream unit, each elementary stream unit including packets having a same PID, when performing the filtering, the PAT and PMT being included in each of the plurality of transport streams, the multiplexer is operable to generate the multiplexed data by multiplexing the PAT, the PMT, and the plurality of parts of information by elementary stream unit, each elementary stream unit including packets having a same PID, and to add transport stream identification information to the PAT, the PMT, and the plurality of parts of information by elementary stream unit, each elementary stream unit including packets having a same PID, which have been multiplexed, wherein the transport stream identification information is information for identifying each of the transport streams to which a part of information by elementary stream unit extracted by said pre-processor belongs, and wherein the external adapter is detachable from the broadcast signal receiving apparatus.