Patent ID: 7379760

Claim:
A data communication system comprising: a first terminal device configured to transmit content and content provider identification data identifying the provider of the content; a server device configured to receive and store the transmitted content and content provider identification data; and a second terminal device configured to transmit user identification data to the server device, configured to receive and store the content from the server device based on the user identification data, and configured to reproduce the stored content upon detection of an incoming call; wherein the server device stores first account information corresponding to the content provider identification data and second account information corresponding to the user identification data, the server device incrementing first amount information in the first account information when receiving the content from the first terminal device, the server device decrementing second amount information in the second account information when transmitting the content to the second terminal device; and the server device decrementing a larger second amount information in response to a higher reproduction audio volume of the content on the second terminal device.