1. An object management system comprising; at least one client device requesting allocation of one or more objects at the designated position in a virtual space, where the virtual space divided into a ordered plurality of partial spaces, and at least one object management device to execute processing concerning one or more objects in the target regions as management target objects, where the target regions are one or more said partial spaces, wherein in the client device, an ordering key enabling to define an ordering relation between each of the partial spaces is calculated for the object becoming a candidate for the target of the management by the object management device, and the object management device decides whether or not to execute the processing concerning the object requested by the client device on the basis of the ordering relation between the ordering key calculated by the client device and the partial space contained in the target region of the object management device and, when the execution is determined, executes the processing concerning the requested object.