hard disk and its driver in practice as an av information accumulating device and a scenario selection and performing agent 30 as a shifting device further respective agents the av information recording portion 14 and the av information data base 15 are connected so that they can give and receive necessary information mutually through a bus b alternatively the download agent 13 is connected so that it can give and receive necessary information to and from an exterior network 16 for example an internet or the like on the other hand each of the above audio memory recorder 19 the cassette deck 21 the cd player 23 the dvd player 25 and the dvd player recorder 27 includes system managing agents 20 22 24 26 and 28 which are connected to an network n and which control the operation of each device in this case the system managing agent 9 and respective managing agents 17 20 22 24 26 and 28 in the av information accumulating unit s are connected respectively so that they can give and receive the information via the network n or the like here each of the above descried agents comprises a module a program module having a self discipline association and learning functions by which each agent determines what should be processed.