Abstract: When the user instructs deletion of all program files using a remote control, a microprocessor of a set-top box repeats transmission of a deletion command with respect to all program files stored in a hard disk recorder to the hard disk recorder and deletes all program files excluding the program file subjected to lock processing among all program files stored in a hard disk recorder. Thus, the set-top box can delete all of unnecessary program files in the hard disk recorder in a short time period.

Abstract: When a user selects a program file using a remote controller and enters a command to delete all together program files with the same program title as the selected program file using the remote controller, a microprocessor in a set-top box (controller device) repeats searching for a program file with the same program title as the selected program file and sending a control command to delete a program file found as a result of the searching to an AVHDD (hard disk recorder) in which the found program file is stored until no more program files with the same program title as the selected program file are found. Accordingly, the set-top box can eliminate the need for a user to select individually all of program files with the same program title before deletion when all of the program files with the same program title are to be deleted.

Abstract: When the user instructs deletion of all program files using a remote control, a microprocessor of a set-top box repeats transmission of a deletion command with respect to all program files stored in a hard disk recorder to the hard disk recorder and deletes all program files excluding the program file subjected to lock processing among all program files stored in a hard disk recorder. Thus, the set-top box can delete all of unnecessary program files in the hard disk recorder in a short time period.

Abstract: A DVD recorder to be connected to an IEEE1394 serial bus, which includes position specifying means for specifying the position of data of unnecessary part in the stream data received from the DV camcorder, storage means for storing information of the position of data of the unnecessary part specified by a user using the position specifying means, and a microprocessor that controls writing of the stream data such that the data of the unnecessary part is not written on the DVD but only data of a necessary part out of the stream data received from the DV camcorder is written on the DVD) based on the information of the position of data of the unnecessary part, which has been read out from the storage means.