Abstract: An electronic device is disclosed. The electronic device comprises a storage unit and a control unit. The storage unit stores a shared file shared by a plurality of virtual devices. If the control unit receives a request to change the shared file from a first virtual device from among the plurality of virtual devices, the control unit copies the shared file to generate a replacement file, and controls a second virtual device sought to share the shared file so as to refer to the replacement file. As such, the shared file is effectively protected, and the security of the electronic device is improved.

Abstract: Provided are a method and system for payer-centric payment using a mobile terminal through which payment is made while information about a payer is not released to a participating store. Specifically, a terminal of the participating store transmits payment information including a payment amount and participating store identification information to an auxiliary terminal, the auxiliary terminal transmits the payment information to the mobile terminal of the payer, the mobile terminal of the payer transmits the payment information and information about a payment means to pay the payment amount to a payment processing system, and finally, the payment processing system pays the payment amount by using the payment means and then transmits information about a result of payment processing to the mobile terminal of the payer and the terminal of the participating store.

Abstract: Provided are a method and system for wireless Internet payment using a mobile terminal through which payment is made through a wireless Internet while information regarding a payer is not released. Specifically, the wireless Internet payment system includes a participating store server providing an online shopping mall, a mobile terminal of a payer selecting information regarding a product to be purchased from among products handled by the online shopping mall through the wireless Internet and transmitting the information to the participating store server, and a payment server processing online payment of the product in connection with the participating store server and the mobile terminal, and the method embodies the wireless Internet payment system. Thus, payment is made while information regarding the payer is not released to the participating store such as the shopping mall, and thus the release of personal information online is prevented.

Abstract: Provided are a method and system for payer-centric payment using a mobile terminal through which payment is made while information about a payer is not released to a participating store. Specifically, a terminal of the participating store transmits payment information including a payment amount and participating store identification information to an auxiliary terminal, the auxiliary terminal transmits the payment information to the mobile terminal of the payer, the mobile terminal of the payer transmits the payment information and information about a payment means to pay the payment amount to a payment processing system, and finally, the payment processing system pays the payment amount by using the payment means and then transmits information about a result of payment processing to the mobile terminal of the payer and the terminal of the participating store.