DATA COMMUNICATION SYSTEM, DATA COMMUNICATION UNIT, DATA COMMUNICATION METHOD AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To realize excellent communication quality by allowing each recipient to select a reception rate and error immunity suitable for each reception environment and to distribute a moving picture medium in real time especially in a multicast environment in the case of simultaneous data communication by many recipients via a network. SOLUTION: A sender side terminal has a coder 1011 that hierarchically encodes data, an FEC data generating section 1013 that generates FEC data, a data transmission section 1012 that transmits both the data as different data series, and an FEC data transmission section 1014. A receiver side terminal has a received series selection section 1036 that selects a proper data series on the basis of a reception state, a data reception section 1031 that receives the selected data series and an FEC data reception section 1032.