Disclosed is a client server system including: a server apparatus equipped with a reproduction section to reproduce accumulated video data in a predetermined reproduction mode including a normal reproduction mode, a fast-forward reproduction mode and a fast-rewind reproduction mode, and a transmission section; a client terminal apparatus equipped with a reception section, a storage section, and an output control section; a selection section to select the reproduction mode; a setting section to set a time lag; and a control section to shift a reproduction position of video data in the first reproduction mode by the time lag, when a second reproduction mode is selected.