There is provided a binary data storage method and device and a storage medium which, upon duplicating binary data stored in an external storage medium into a data storage device, is capable of generating inside the data storage device a folder having a name which is appropriate for the data without the user having to perform manipulations or confirm the content of the data. The existence of still image data inside a memory card is confirmed and the existence of meta data inside the memory card is confirmed, a folder having a name based on the meta data is generated in a HDD inside the binary data storage device, the still image data inside the memory card is read out and the still image data is duplicated into the generated folder, producing the result that when the still image data inside the memory card is duplicated or stored into the binary data storage device a folder having a name which is appropriate for the data is generated inside the binary data storage device without the user having to perform manipulations or confirm the content of the data.