A video/audio data output device includes a demultiplexing section, a video decoder that generates video data by decoding the video stream signal, an audio decoder that generates audio data by decoding the audio stream signal, a video output section that outputs the video data in synchronism with the system clock, an audio output section that outputs the audio data in synchronism with the system clock, a video adjusting section, and an audio output adjusting section. The demultiplexing section demultiplexes a video stream signal, an audio stream signal, and a system clock from an input signal, the video adjusting section processes a video frame that has been output from the video output section, and the audio output adjusting section delays the system clock to be supplied to the audio output section, in accordance with a length of time that the video adjusting section takes to process the video frame.