Patent ID: 7382737

Claim:
A reception terminal communicating with an information distribution server including: fragment data generation means for generating fragment data with respect to a certain data aggregate that is one of a plurality of data aggregates using a coded matrix, wherein the fragment data is capable of restoring the certain data aggregate based on the coded matrix when the fragment data is collected to a required count; code provision means for providing the fragment data generated by the fragment data generation means with an identification code associated with the certain data aggregate restored by the fragment data; and transmission means for transmitting the fragment data having the identification code provided by the code provision means to the reception terminal, the reception terminal comprising: reception means for receiving the fragment data transmitted from the information distribution server; and restoration means for distinguishing the fragment data received by the reception means based on the identification code provided to the fragment data and restoring the certain data aggregate based on the coded matrix; and detection means for detecting a traveling speed of the reception terminal itself; wherein the plurality of data aggregates includes a digest data aggregate including digest information and a detailed data aggregate including detailed information whose category is equal to that of the digest information; and the reception means receives both fragment data generated from the digest data aggregate and fragment data generated from the detailed data aggregate; when the traveling speed detected by the speed detection means is not smaller than a specified value, the reception means receives the fragment data generated from the digest data aggregate, and when the traveling speed is smaller than the specified value, the reception means receives the fragment data generated from the detailed data aggregate.