Abstract: A large-capacity-data high-speed-transfer system transfers large capacity data at high speed with millimeter-wave near field communication (NFC) from a first host device to a second host device. The system includes: a large capacity data card having a millimeter-wave NFC capability, the large capacity data card being fitted with a typical large capacity data memory capable of storing the large capacity data; and a host device adapter to be connected to a host device including the first host device and the second host device, the host device adapter having the millimeter-wave NFC capability, and executing millimeter-wave NFC communications with the large capacity data card to transfer the large capacity data at high speed between the large capacity data card and a host device to be a destination.