According to an exemplary embodiment of the present disclosure, a method for transforming a document with each of a plurality of file formats, performed by a computing device includes receiving a request for transforming a document with each of a plurality file formats into application model data having a structure or format which is available for an application for loading and storing the document; generating intermediate hierarchical data between the document with each of the plurality of file formats and the application model data, using the document with each of the plurality of file formats, in response to the received request; and transforming intermediate hierarchical data generated corresponding to each of the plurality of file formats into application model data corresponding to each of the plurality of file formats.