A data processing method is disclosed which includes the steps of: (a) generating edit data which includes a unique material identifier for uniquely identifying material data to be edited and of edit content of the material data; (b) generating management data indicative of the unique material identifier in association with a storage location where the material data identified by the unique material identifier are stored; (c) specifying the storage location where the material data associated with the unique material identifier included in the edit data generated in step (a) are stored, on the basis of the management data generated in step (b); and (d) acquiring the material data from the storage location specified in step (c).