A network order system comprising: plural order entry channels (14a, 14b) through each of which an order is placed by a customer and each of which sends order information and customer information of the order; plural first retailer systems each of which does not manage the customer information; plural second retailer systems each of which manages the customer information; a network server for receiving and managing the order information, or both the order information and the customer information and having a first database; a communication network for connecting the order entry channels (14a, 14b), the first retailer systems, the second retailer systems, and the network server; wherein each of the first retailer systems has means for transmitting identification information of the first retailer system, together with the order information and the customer information from the order entry channel to the network server; wherein each of the second retailer systems has a second database, means for performing an authentication process of the order entry channel, means for receiving the customer information from the order entry channel when the order entry channel passes the authentication, means for storing and managing the customer information in the second database, and means for transmitting identification information of the second retailer system, together with the order information from the order entry channel to the network server; and wherein said network server comprises means for judging whether the order entry channel has been authenticated by a retailer system or not, means for performing an authentication process of the order entry channel when the order entry channel is judged as unauthenticated, means for receiving the order information, or both the order information and the customer information from the order entry channel, as well as receiving identification information of one of the second retailer systems from the second retailer system, or as well as receiving identification information of one of the first retailer systems from the first retailer system. and means for storing and managing the order information, or both the order information and the customer information related to the identification information of the second retailer system or the identification information of the first retailer system in the first database. plural order entry channels (14a, 14b) through each of which an order is placed by a customer and each of which sends order information and customer information of the order; plural first retailer systems each of which does not manage the customer information; plural second retailer systems each of which manages the customer information; a network server for receiving and managing the order information, or both the order information and the customer information and having a first database; a communication network for connecting the order entry channels (14a, 14b), the first retailer systems, the second retailer systems, and the network server; wherein each of the first retailer systems has means for transmitting identification information of the first retailer system, together with the order information and the customer information from the order entry channel to the network server; wherein each of the second retailer systems has a second database, means for performing an authentication process of the order entry channel, means for receiving the customer information from the order entry channel when the order entry channel passes the authentication, means for storing and managing the customer information in the second database, and means for transmitting identification information of the second retailer system, together with the order information from the order entry channel to the network server; and wherein said network server comprises means for judging whether the order entry channel has been authenticated by a retailer system or not, means for performing an authentication process of the order entry channel when the order entry channel is judged as unauthenticated, means for receiving the order information, or both the order information and the customer information from the order entry channel, as well as receiving identification information of one of the second retailer systems from the second retailer system, or as well as receiving identification information of one of the first retailer systems from the first retailer system. and means for storing and managing the order information, or both the order information and the customer information related to the identification information of the second retailer system or the identification information of the first retailer system in the first database.