Patent ID: 7657490

Claim:
A transaction system for transacting through a communication network, comprising: a first terminal connecting to the communication network and having an information indicating unit; a second terminal that is at least one of a cellular telephone and a PDA and having a unique ID information, an antenna and an input unit, said second terminal being connectable to said first terminal through the communication network with said antenna; and a transaction apparatus communicating with said first and second terminals through the communication network, said transaction apparatus storing said unique ID information of said second terminal in advance, said transaction apparatus setting up and sending a transaction ID information to said first terminal, said transaction apparatus receiving from said second terminal said unique ID information of said second terminal together with said transaction ID information, said transaction apparatus performing the transaction by synchronizing a communication with said first terminal and said second terminal when said unique ID information received from said second terminal is identical with that stored in said transaction apparatus in advance previously and when said transaction ID information received from said second terminal is identical with that set up by said transaction apparatus and sent to said first terminal, wherein said first and said second terminals send and receive messages therebetween via the transaction apparatus during synchronizing.