Electronic trading system including an auto-arbitrage feature or name switching feature

(57) A summary electronic trading system receives trust parameter data, arbitration parameter data, and data transfer from dealings substance, and contains two or more agent terminals which display dealings information to this dealings substance. The price offered information as which data transfer is inputted from dealings substance -- it wears and/or price-asked information is included. Including the computer by which the system was further connected to two or more agent terminals through the communication network, from two or more agent terminals, this computer receives trust parameter data and data transfer, and is memorized. A system Trust parameter data and arbitration parameter data, The detector circuit or program which detects automatically the possible arbitration transaction which includes two or more dealings based on data transfer, and the circuit or program which performs a possible arbitration transaction automatically by performing all the dealings of two or more is also included. As for the same electronic trading system, two or more agent terminals receive name change parameter data, trust parameter data, and data transfer from dealings substance in this case including an automatic name change function. A circuit or a program detects a possible name change transaction automatically based on trust parameter data, name change parameter data, and data transfer.