Differential data - generating system, data updating the system and differential data - generating method

摘要

The present invention, it is an object of the invention, a technology, which in order to improve the effect of reducing differential data in the size is capable of. A bit - shift unit 4a is displaced either old data or new data in a forward direction and a reverse direction of their bits - chain in each case by 0, 1, 2,.., and n bits, in order to generate a plurality of data. A copying - bits - chains an extraction unit 4b information extracted by means of copying - bits - chains, based on the plurality of data and other hand it is not - shifted data. An addition - bits - chains an extraction unit 4c is both copying - bits - chains of the new data, information relating to the addition of - bits - chains to extract. A differential data - generating means 6 generates a differential data, based on the information on copying - bits - chains and the information about the addition of - bits - chains.