Abstract: According to one embodiment, a securities trading system comprises a plurality of order sharing devices and a plurality of ordering devices. The order sharing device sends each telegram to the ordering device of a master system and the order sharing device of a slave system. The order sharing device sends each of the telegrams to the ordering device of the slave system to switch from the slave system to the master system when a failure is detected in the ordering device of the master system. The ordering device calculates statistics from market information, and uses the statistics to judge whether to permit the placement of an order with the stock exchange apparatus in the case of the master system.

Abstract: According to one embodiment, a market information simulator delivers a simulation time faster than a real time to a market simulator. The market information simulator delivers historical market information including the same time as the simulation time to an algorithm processor. The algorithm processor orders and determines the historical market information, and sends, to the market simulator, order information in which a time in the historical market information is added to order contents. The market simulator creates market board information from the historical market information. The market simulator determines the market board information and the order information by agreement.