The present invention has been made to facilitate search or management of video data. The present invention generates a display space defined by display axes determined by feature parameters representing the feature of video data or audio data or associated parameters linked to the video data or audio data, converts feature values designated by the feature parameters or associated values designated by the associated parameters into coordinate parameters corresponding to a position on the display axes on the display space, and displays the video data through a display window on the display space in accordance with the change of the position corresponding to the converted coordinate parameters.