Disclosed is a method of data processing in an apparatus such as a photographing apparatus. The method includes: determining a file format to record data among a plurality of file formats comprising a dedicated file format and a common file format; recording the data in a file of the common file format and generating an auxiliary file corresponding to the file of the common file format, if the common file format is determined; and recording, in the auxiliary file, information about the dedicated file format and recording information for reading the data in the file of the common file format.