[Problem] To enable a speedy stock transaction using a portable terminal while reflecting the real-time price of the stock. [Solution] A list of tradable stocks is displayed on a transaction terminal 110, and when a user has selected any one company from among the displayed companies, buttons necessary for buying/selling stocks of the selected company are displayed on the transaction terminal 110. When the user has indicated his/her intention to buy or sell and entered a transaction amount (buying or selling amount), the number of stocks based on the entered transaction amount is displayed on the transaction terminal 110. The number of stocks based on the entered transaction amount is to be determined by reference to the real-time price of the stock. When the user's intention for a transaction at the calculated stock price is ultimately confirmed, a transaction execution request for the execution of the transaction is transmitted from the transaction terminal 110 to a securities system 120.
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