To grasp an accurate commody purchase trend at the time of sales planning and to execute sales management based on customers' commodity purchase trends by recognizing the regularity of each customer's commodity purchase trend.

A work station 20 executes an analytical processing request, a handling edition request for analytical commodity sorting and an analytical commodity sort updating request, displays sorted information and totalized information on a screen and prints out these information. A sever 21 updates the analytical commodity sort, executes retrieving, sorting and totalizing processing and executes also analytical commodity sort handing edition processing. The registering processing of each analytical commodity in a sort code and the information trend analytical processing of commodity sales experience are simultaneously executed by the work station 2O and the server 21, which registers the analytical commodity code based on an analytical condition set value specified by sales experience information trend analytical processing and constructs the data of an analytical commodity sort master data base 52 based on the regularity detected based on the commodity sales experience information.