Patent ID: 8885633

Claim:
A data communication method, for downloading data to a communication terminal, comprising steps of: requesting an object data management information, wherein the communication terminal transmits a request for object data management information, including size information for the object data to be downloaded; receiving the object data management information, wherein the communication terminal receives the object data management information; adjusting a data receive environment, wherein the communication terminal adjusts an environment for receiving the object data, based on the size information for the object data; requesting a download, wherein the communication terminal transmits a download request for the object data; receiving object data, wherein the communication terminal receives the object data; and detecting operating power remaining amount, wherein the data receive environment adjustment step comprises a step of determining a data communication system used in downloading the object data, based on the size information for the object data, and comprises a step of determining a free space size; and the communication terminal designates the determined communication system to transmit the object data download request in the download request step, wherein when the size of the object data is less than a specified size, the data communication system is determined to be a first communication system, while when the size of the object data is the specified size or greater the data communication system is determined to be a second communication system in the data communication system determination step, wherein the specified size is determined in dependence upon packet communication conditions, wherein the download request step is executed in dependence upon the free space determination step, wherein status information is displayed when the detected operating power remaining amount is not sufficient, further comprising a step of confirming a download request, wherein the communication terminal having received the object data management information displays the object data size, and entrusts determination as to whether or not the download request step is executed to a user of the communication terminal, wherein when the detected operating power remaining amount is not sufficient, download operations are stopped.