then the receiver module 33 stops the transfer of the stream to the stream descriptor module 31 step s65 and the stream descriptor module 31 returns an end stream instruction to the client application 11 step s66 finally an explanation will be made of the processing for closing the stream transfer mechanism by referring to fig1 note that here an explanation will be made of a case where the stream transfer mechanism is closed during the stream transfer when the client application 11 requests a method 34 close 34 to the stream descriptor module 31 step s71 the stream descriptor module 31 requests interruption of the transfer of the stream to the receiver module 33 step s72 then the receiver module 33 first stops the output of the stream to the sink module 12 step s73 and further requests the interruption of transfer of the stream to the feeder module 32 of the data processing apparatus 20 step s74 and then returns the data of the interruption position of the stream to the stream descriptor module 31 step s75 next when the stream descriptor module 31 requests the opening of the receiver module 33 step s76 the receiver module 33 of the data processing apparatus 10 requests the disconnection of the line and the opening of the feeder module 32 to the feeder module 32 step s77 by this the feeder module 32 notifies the ending of the processing for transfer of the stream to the source feeding module 21 and the feeder module 32 becomes free.