A method for verifying transaction details is provided to enhance transaction security and verification reliability by generating one-time character string data corresponding to individual transaction information and making a user input a character string through an input device. The transaction information having a predetermined form is generated according to the inputted transaction details, and generates and outputs the one-time character string data corresponding to the transaction information based on a predetermined rule(S13). The user is identified by more than one of handwriting and voice input according to the output one-time character string data. Inputted identification data is stored by linking with the transaction information(S16). The transaction details are verified by extracting/comparing the stored identification data and transaction information with the character string data corresponding to the transaction information.
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