A data processing apparatus in which attachment of removable memory card is detected and it is determined whether or not binary data is stored in the memory card. If it is determined that binary data is stored in the memory card, it is further determined whether or not meta data is stored in the memory card. If it is determined that the meta data is stored, the meta data is added to the binary data. If it is determined that no meta data is stored, meta data registration processing is started, and addition processing is performed after registration of the meta data. On the other hand, if it is determined that no binary data is stored, the registration processing is started to register the meta data in the memory card.