A sales office system acquires information about a customer's attention to financial commodities without demanding special operations from the customer and provides effective information matching the acquired customer's attention. In the sales office system that connects with plural information processors via networks, a sales office system server includes a part that cooperates with an Internet banking server, a part that cooperates with a customer management server, a part that acquires dealing statuses, a part that acquires consultation reservation information, a part that acquires commodity information, a part that determines valuable information by valuable information criteria, and a part that holds customers' operation histories, and effective sales are performed for customers by flexibly and effectively using information about purchasers of a variety of commodities.