Abstract: The present invention provides a portable computers capable of facilitating management of actual photo-image in association with each other, thereby remarkably expanding the application range of the actual phot-image data. The portable computer is connectable directly or through a memory medium to the main computer in a fixed base. The portable computer comprises: a digital camera detachably provided for successively taking actual photo-images; position specifying identification data setting means for setting identification data to specify at least one of photographing related positions consisting of a position of an object for photography taken by said digital camera and a position where photography was taken by said digital camera; and actual photo-image data memory means for storing the identification data set by said position specifying identification data setting means in association with actual photo-image data outputted from the digital camera.

Abstract: A read/write method using a non-contact system and used between a storage substrate and a read/write unit, the method including a storage substrate providing a memory at a card or other substrates, and a read/write unit, the storage substrate providing a coil for power supply, a coil for receiving data to be recorded in a memory, a coil for outputting toward the read/write unit the data recorded in the memory, and a coil for receiving a mode command, the read/write unit providing coils corresponding to four coils at the storage substrate, so that the respective corresponding coils at the storage substrate are insertably positioned in the magnetic flux generated by each coil at the read/write unit, whereby the read/write unit writes data in the memory at the storage substrate, or the data stored in the memory at the storage substrate is read by the read/write unit.