A plurality of POS terminals are divided into a plurality of groups. The POS terminals belonging to the same group hold the same sales information, thus realizing data backup. The division of the POS terminals into groups is variably set.

 
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< Automated presentation layer content management system

< Collecting, analyzing, consolidating, delivering and utilizing data relating to a current event

> Communication management system

> Data storing system, issuing apparatus, data providing apparatus and computer readable medium storing data storing program

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