Abstract: A service information providing method of providing various pieces of service information stored in a host apparatus to a terminal apparatus connected to the host apparatus by a wire or wireless, includes the steps of registering identification information related to the terminal apparatus for receiving the service information in the host apparatus and an IC card freely detachable from a terminal apparatus, confirming whether the registered electronic device is set in the terminal apparatus represented by the registered identification information, and when it is confirmed in the confirmation step that the electronic device is set in the terminal apparatus, providing the service information stored in the host apparatus to the terminal apparatus represented by the registered identification information.

Abstract: A service information providing method of providing various pieces of service information stored in a host apparatus to a terminal apparatus connected to the host apparatus by a wire or wireless, includes the steps of registering identification information related to the terminal apparatus for receiving the service information in the host apparatus and an IC card freely detachable from a terminal apparatus, confirming whether the registered electronic device is set in the terminal apparatus represented by the registered identification information, and when it is confirmed in the confirmation step that the electronic device is set in the terminal apparatus, providing the service information stored in the host apparatus to the terminal apparatus represented by the registered identification information.

Abstract: A computer network system includes a first computer of a first corporation having a plurality of member shops and a second computer of a second corporation which is the member shop of the first corporation and runs a virtual shop on a network. The first computer includes a memory for storing display information indicating that a corresponding shop is the member shop of the first corporation, a memory for storing encryption information for encrypting the display information, and an output section for encrypting the display information by the encryption information and outputting the encrypted display information. The second computer includes a reception section for receiving the encrypted display information through the communication line, and a memory for storing the received encrypted display information.

Abstract: A card transaction system and method which includes the card medium, an accepting apparatus for the card medium, and a host computer of a card medium issuer connected to the accepting apparatus via a communication line, comprises, an approving function for causing the host computer to answer one credit inquiry from the issuer so that the host computer approves right of use for the card medium within a predetermined amount of money without a necessity of performing a credit inquiry, a supply function for causing the accepting apparatus to supply information of the right of use to the card medium when the approving function approves the right of use, and a function for causing information of the right of use to be stored in a storage region of the card medium so as to realize a plurality of transactions with the card medium within the predetermined range of the amount of money without the necessity of performing the credit inquiry.