A method for performing a payment process based on Infrared Financial Messaging using a mobile communication terminal with a card chip embedded therein, comprising the steps of: (a) creating a list of available applications supported by the card chip within the mobile communication terminal and a payment-processing terminal, selecting one application from the list to be used for a transaction among specifications supported by the card chip and the mobile terminal, and initiating processing of said transaction; (b) checking a password of a user of the mobile communication terminal according to an authentication procedure in an off-card module, establishing a radio link between the mobile communication terminal and the payment-processing terminal in response to a stroked specific key if the user is authenticated, and receiving a credit information request from the payment-processing terminal through the established radio link; wherein said off-card module is implemented as a software module; wherein, when the specific key is stroked, the step b) allows an application software module included in the mobile communication terminal to search for a radio link to the payment-processing terminal and connects the mobile communication terminal to the radio link in response to a connection request message for a radio link connection continuously transmitted from the payment-processing terminal; (c) transmitting a message comprising an Authorization Request Cryptogram and membership information to the payment-processing terminal in response to the credit information request; (d) receiving by the off-card module the message comprising an Authorization Response Cryptogram from the payment-processing terminal, and as a response to the message comprising an Authorization Request Cryptogram, to request the card chip to authenticate an issuer, and to transmit a digital receipt resulted from a transaction to the payment-processing terminal if the issuer is authenticated; and (e) receiving by the off-card module of a transaction completion message from the payment-processing terminal and releasing a connected session for the transaction. (a) creating a list of available applications supported by the card chip within the mobile communication terminal and a payment-processing terminal, selecting one application from the list to be used for a transaction among specifications supported by the card chip and the mobile terminal, and initiating processing of said transaction; (b) checking a password of a user of the mobile communication terminal according to an authentication procedure in an off-card module, establishing a radio link between the mobile communication terminal and the payment-processing terminal in response to a stroked specific key if the user is authenticated, and receiving a credit information request from the payment-processing terminal through the established radio link; wherein said off-card module is implemented as a software module; wherein, when the specific key is stroked, the step b) allows an application software module included in the mobile communication terminal to search for a radio link to the payment-processing terminal and connects the mobile communication terminal to the radio link in response to a connection request message for a radio link connection continuously transmitted from the payment-processing terminal; (c) transmitting a message comprising an Authorization Request Cryptogram and membership information to the payment-processing terminal in response to the credit information request; (d) receiving by the off-card module the message comprising an Authorization Response Cryptogram from the payment-processing terminal, and as a response to the message comprising an Authorization Request Cryptogram, to request the card chip to authenticate an issuer, and to transmit a digital receipt resulted from a transaction to the payment-processing terminal if the issuer is authenticated; and (e) receiving by the off-card module of a transaction completion message from the payment-processing terminal and releasing a connected session for the transaction.