The invention relates to a method for determining the priority of a management object in a device management system comprising management object data in a management tree for maintaining the arranged device management server and management customer device. The contents of sub objects included in at least one management object of the management tree are determined, and thereafter the management server determines a data element comprising the priority data of the sub objects in relation to other sub objects. The data element is attached to the management tree maintained by the management server, and a file definition according to said management tree is sent to a management customer device. The management customer device deassembles the file definitions into management tree form so that the priority data shows the priority data of the sub objects in relation to the other sub objects.