Abstract: A market trade supporting method and a market trade supporting apparatus that are able to determine the appropriate price of stop order. The sell order price of stop order for loss cut is set based on the lowest price in the period of temporary fall which is until it rises to exceed the level of prior declines after the market price temporary falls when it is on uptrend. The buy order price of stop order for loss cut is set based on the highest price (ceiling price) in the period of temporary rise which is until it calls to exceed the level of prior rises after the market price temporary rises when it is on downtrend.