A card type peripheral apparatus connected to a host apparatus for communication therewith according to a specific protocol. The card type peripheral apparatus includes a plurality of configuration registers configured to be accessible by the host apparatus and to be set with diverse set information. At least one of the plurality of configuration registers is a special register configured to be set with data arbitrarily selected and fixedly established by a vendor that either fabricates or markets the card type peripheral apparatus. The special register is set with protocol identification information for discriminating the specific protocol.