To provide a tennis skill improvement support system in which a database formed by associating data obtained by digitizing the change of speed and direction of a ball before and after falling to the ground of a ball hit in a service operation of tennis with video data of the service operation is constructed, and thereby the operation in the database can be retrieved by a numerical value, own operation can be referred to, or an improvement condition can be grasped in comparison with the past numerical value.SOLUTION: A tennis skill improvement support system includes: means for recording a video of an operation of a servicing player; means for calculating a velocity vector of a ball before and after the ball falls to the ground from a trajectory of the ball; means for constructing a tennis skill improvement support database 1 obtained by associating the velocity vector with the operation of the player, in a server 4 by a maintenance terminal 5; and means for enabling access to the database 1 from an information retrieval terminal 3 via a wide area network 2.SELECTED DRAWING: Figure 1
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