provided are a transaction system and a transaction method . the transaction system comprises : a first electronic signature tool for making a first signature on transaction data and sending the transaction data subjected to the first signature to a network bank server ; the network bank server for receiving the transaction data sent by the first electronic signature tool having been subjected to the first signature and performing authentication thereon , and sending the transaction data to at least one second electronic signature tool after the authentication has passed ; and the at least one second electronic signature tool for receiving the transaction data sent by the network bank server , performing verification on the transaction data , receiving confirmation information input by a user after the verification has passed , and making a second signature on the transaction data and sending the transaction data having been subjected to the second signature to the network bank server . the present invention ensures the security of a transaction process , realizes remote transaction in the case that a transaction initiation party and a transaction confirmation party are not present simultaneously , and is convenient to use and strong in security .