To appropriately function a burglar prevention system for appropriately confirming connection of units even if a user intentionally exchanges the unit and preventing burglar of a unit group by confirming connection of the units.

A center (Z) 2 manages connection confirmation information used for confirmation of connection of the units (A)3 to (D)6, reads connection confirmation information from the unit and writes connection confirmation information to the unit. When the user intentionally exchanges the unit, regular connection confirmation information is written into the unit where connection confirmation information is necessary for rewriting. Thus, the burglar prevention system for permitting the units to appropriately confirm connection and for preventing burglar of the unit group by confirming connection between the units is appropriately functioned.

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