When the content data recorded in the server device 100 is reproduced in the client device 200 through communication, the contents transmitting system shorten the time to reproduction of content data in reply to a reproduction request from the client device 200. In order to shorten the time up to the reproduction, in the server device 100, a start portion of the content data for an arbitrary time is prepared, which is encoded at a different rate from the encode rate of the content data as for the transmission bandwidth at the previous reproduction of the content data, and it is transmitted to the client device 200 and reproduced at the reproduction starting time. At the time of transmitting the content data, the server device 100 transmits the initial portion of the content data while encoding it for an arbitrary time at real time at a different encode rate as mentioned above, and client device 200 reproduces it.