1. A method for generating and controlling logging data in a device management (DM) system comprising: receiving, by a DM client, a command for storing logging data from a DM server; determining, by the DM client, a position for storing the logging data in a logging sub-tree, wherein the logging sub-tree comprises a ‘Control’ node; a control part connected with the ‘Control’ node for controlling a method for storing the logging data; a ‘Data’ node; and a data part connected with the ‘Data’ node for providing a space for storing the logging data, wherein the control part comprises a ‘Size’ node indicating a maximum number of logging data that can be stored, a ‘Current’ node indicating a position where a next logging data is to be stored, and a ‘Recursive’ node indicating how to process new logging data when the space for storing the logging data is full; and storing, by the DM client, the logging data in the determined position in the logging sub-tree, wherein the step of storing the logging data comprises: checking, by the DM client, whether there is an empty logging storage space; if there is an empty logging space, generating, by the DM client, a new folder node indicated by a value of the ‘Current’ node and storing the logging data in the new folder node; if there is no empty space, checking, by the DM client, whether a value in the ‘Recursive’ node within the logging sub-tree is true; determining, by the DM client, a position of a node to be deleted with reference to a value of the ‘current’ node if the value of the ‘Recursive’ node is true; and deleting, by the DM client, all data included in the determined node and storing the logging data.