Patent ID: 8015066

Claim:
A POS server that manages deals of products at a plurality of stores, a plurality of control apparatuses, each of said plurality of control apparatuses comprising: a dealing database that stores information of said deals of products operated at a plurality of local terminals; a receiving device that receives a database operating instruction from said local terminals to update said dealing database about said deals of products; a database updating device that updates said dealing database according to said database operating instruction to be received whenever said database operating instruction is received from said local terminals, whereby each of said receiving devices of said plurality of control apparatuses receives a same database operating instruction transmitted to said control apparatus from said local terminal; a holding device that holds said received database operating instruction; a matching check device that checks matching of said database operating instruction held at each of said holding devices of said plurality of control apparatuses; and a recovering device that recovers said database operating instruction lost at the holding device of one of said control apparatuses by getting the lost database operating instruction from one of said holding devices of said other control apparatuses that have said database operating instruction which is lost, wherein said database updating device updates said dealing database according to said recovered database operating instruction.