Method and system for authenticating transaction request from device

A method of requesting, by a device, a transaction with a point of sale (POS) terminal, the method comprising:

• receiving a password input by a user;
• in response to the password being correctly input by the user, displaying a graphical user interface (GUI) on the device for obtaining at least one authentication information;
• obtaining the at least one authentication information based on a user input to the device through the GUI by controlling at least one of a camera, a microphone, a fingerprint recognizing apparatus and a touch screen;
• storing the obtained at least one authentication information;
• and
• receiving authentication information, which is generated by the POS terminal based on a user input of the user to the POS terminal, from the POS terminal when the device enters within a predetermined range from the POS terminal after the user of the device is authenticated by the device based on the password input by the user,
• comparing the obtained at least one authentication information with the received authentication information, and
• providing the obtained at least one authentication information, coupon information and card information which is used in the transaction with respect to a product or a service to the POS terminal, based on a result of the comparing,
• wherein the obtaining the at least one authentication information comprises obtaining a plurality of types of the authentication information and presetting the plurality of types of the authentication information according to payment amounts of the product or the service, in response to the password being correctly input by the user,
• wherein a type of the authentication information from among the plurality of types of the authentication information is determined according to a payment amount of the product or the service to be purchased based on a user input, and
• wherein the providing the obtained at least one authentication information, the coupon information, and the card information comprises comparing the determined type to a type of the received authentication information, and providing the obtained at least one authentication information, the coupon information, and the card information when the determined type is the same as the type of the received authentication information and the obtained at least one authentication information corresponds to the received authentication information,
• wherein the provided at least one authentication information is compared, by the POS terminal, to the authentication information generated by the POS terminal for authenticating the transaction.