A data communication system and data communication method capable of drastically improving the quality of a dynamic image service to be offered to a user. The data communication system comprises a mobile communication terminal (1-2), an application server (1-1) for fetching data open to the public on a network (1-7) in accordance with a request from the mobile communication terminal (1-2) and conducting a data rate conversion for delivery to the mobile communication terminal (1-2) and conducting data delivery and transferring the fetched data to a predetermined transferred destination, and a home server (1-5) provided in a base of a possessor of the mobile communication terminal (1-2) for receiving the data, fetched by the application server (1-1) and transferred, through the network (1-7) and accumulating the data to regenerate the data as needed.