1. An image processing device which is connected to a device management apparatus via a network, the device management apparatus managing the image processing device based on device information received from the image processing device and described in accordance with the Common Information Model CIM, the image processing device including a processing unit comprising: a first transform part to transform, when a query described in a general-purpose language to include a request of data handling of device information with respect to jobs is received from a requesting source, CIM objects, generated on a memory unit from the device information with respect to the jobs, into XML data items respectively; a combining part to combine the XML data items from the first transform part into XML data and generate the combined XML data on the memory unit; an extracting part to extract at least one XML data item associated with the data handling request from the combined XML data from the combining part; and a second transform part to transform the XML data item from the extracting part into at least one CIM object, wherein the image processing device performs data handling including at least one of transforming, combining and extracting of the at least one CIM object and transmits a result of the data handling to the requesting source, and wherein the extracting part determines whether a CIM object corresponding to the job associated with the data handling request is found in the combined XML data, and wherein the extracting part extracts the XML data corresponding to the CIM object if it is determined that the CIM object is found in the combined XML data, and generates the CIM object based on the extracted XML data.