| 摘要 |
Static image data of materials used in videoed lectures and the like is presented to browsing users synchronously with video data. As video data is reproduced by a video player of a browsing client, reproduction time positions of the video data are obtained in an image synchronous function part, static image data associated in advance with the reproduction time positions is requested from a delivery server holding the video data and static image data associated with the video data, and the static image data is provided from the delivery server and displayed in an image display part.
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