Abstract: An information processing terminal includes a calculation processing unit, a telephone communication processing unit for performing a telephone communication with respect to another appliance, a communication processing unit for performing a communication operation with respect to the another appliance, and a signature calculating unit in which when a telephone communication with respect to the above-described another appliance is carried out, a signature using a secret key is produced by the calculation processing unit, and the signature calculating unit produces information attached with signature to which the produced signature has been attached. In the information processing terminal, the telephone communication processing unit transmits the information attached with signature to the another appliance corresponding to a telephone calling destination.

Abstract: Conventionally, obtaining both information regarding use of a credit card and information regarding an account to which credit card payment is debited is not considered. For instance, when paying by credit using a communication terminal device, obtaining information regarding a payment amount and information regarding a bank balance is not considered. Thus, a communication terminal device capable of transmitting/receiving data, comprises: a communication portion transmitting/receiving data; a display portion displaying information received by the communication portion; and a control portion controlling the communication portion and display portion, wherein the communication portion receives card use information from a server of a card company and account information from a server of a financial institution; and wherein the control portion operates to display the card use information and the account information side-by-side on the display portion.

Abstract: An information processing terminal includes a calculation processing unit, a telephone communication processing unit for performing a telephone communication with respect to another appliance, a communication processing unit for performing a communication operation with respect to the another appliance, and a signature calculating unit in which when a telephone communication with respect to the above-described another appliance is carried out, a signature using a secret key is produced by the calculation processing unit, and the signature calculating unit produces information attached with signature to which the produced signature has been attached. In the information processing terminal, the telephone communication processing unit transmits the information attached with signature to the another appliance corresponding to a telephone calling destination.