1. An integrated circuit for video/audio processing that processes a video and audio signal, comprising: a microcomputer including a CPU (central processor unit); a stream input/output operable to receive/output a video and audio stream to/from an external device, under a control of said microcomputer; a media processor operable to execute a media processing including at least one of compression and decompression of the video and audio stream inputted to said stream input/output or outputted from said stream input/output under a control of said microcomputer; an AV input/output operable to convert the video and audio stream subjected to the media processing in said media processor and output the video and audio stream to a first external apparatus, or acquire the video and audio signal from a second external apparatus and convert the video and audio signal into a video and audio stream subjected to the media processing in said media processor, under the control of said microcomputer; and a memory interface operable to control a data transfer between a memory and said stream input/output, said media processor and said AV input/output, under a control of said microcomputer, wherein said stream input/output, said media processor and said AV input/output are connected to said memory interface by plural data buses, and when a video and audio stream is exchanged between any two of said stream input/output, said media processor and said AV input/output, said video and audio stream is exchanged therebetween through said memory interface by using said memory, and wherein said data buses comprise respective plural dedicated data buses; each of said stream input/output, said media processor and said AV input/output is connected to said memory interface by each of respective plural dedicated data buses; and each of the respective plural dedicated data buses is associated to one of said stream input/output, said media processor and said AV input/output.