To dispense with repeated ledger management and filing of document copies even concerning inquiry about a commodity defect and a commodity.

The respective terminals of a user, a business department 2 directly having contact with the user, an information window 3 for accepting an inquiry about the commodity defect and commodity, a general window 4 for managing the inquiry about the commodity defect and commodity, and an answer department 5 responsible for the inquiry about the commodity defect and commodity are connected to a global market customer quality information system 10 through a network. The global market customer quality information system 10 includes a database 1 for centralized-saving the information on the inquiry about the commodity defect and commodity. The user 2, the information window 3 and the general window 4 gain access to the global market customer quality information system 10 to register the information on the inquiry about the commodity defect and commodity, or retrieve the information stored in the database 1.