Patent ID: 7607163

Claim:
A video playing system for playing video data divided into a plurality of blocks, the system comprising: a delivery part that delivers video data; a playing part that plays the delivered video data; a detection part that detects instantaneous viewing speed of the video data at only three points, (1) at a start point of a block of interest, (2) at an end point of the block of interest, and (3) at an intermediate point of a block of interest, wherein the intermediate point is between the start point and the end point of the block of interest; said intermediate point is not adjacent to said end point; a comparison part that compares the detected viewing speed at the start point of the block, the viewing speed at the end point of the block, and the viewing speed at the intermediate point, against a predetermined speed condition and determines if the detected viewing speeds at the three points comply with the predetermined speed condition; a generating part that generates viewing information indicating whether a user has completed viewing the block of interest when the comparison indicates that the detected viewing speeds at the three points comply with the predetermined condition; and a transmission part that transmits the generated viewing information to the delivery part.