PROBLEM TO BE SOLVED: To visualize identification information on a reproduction sound of posting data subjected to collaboration.SOLUTION: When a karaoke apparatus 10 posts posting data composed of sound recording data and picture recording data of a user to a posting server 30, the karaoke apparatus 10 gives identification information indicating a kind of a sound source of the sound recording data included in the posting data. On the other hand, the karaoke apparatus 10 simultaneously reproduces a plurality of posting data subjected to collaboration by downloading the data from the posting server 30. At that time, on the basis of identification information of each piece of the sound recording data, image information indicating the kind of the sound source of the sound recording data is superposedly displayed in a display area on a screen for displaying reproduction image of a participant corresponding to each piece of the sound recording data. A viewer of posting data for collaboration can recognize at glance what sound it is, who emits the sound and how the sound is emitted, when viewing the displayed kind of the sound source together with the reproduction image of the participant in the collaboration.
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