A data transferring device and a data transfer method. The data transferring device for transferring an audio-visual stream stored in a first medium to a second medium, includes: a reader comprising reading circuitry configured to read the audio-visual stream from the first medium; and a controller configured to: extract an audio packet and a video packet from the audio-visual stream; write the audio packet and video packet to the second medium; and store, in a memory, first location information indicating locations at which the audio packet and the video packet are written in the second medium, and second location information indicating locations at which the audio packet and the video packet are read from the first medium.