A store system comprising: an information terminal which is provided in a store, the information terminal being mounted on a shopping cart and inputting identification data of a commodity for identifying the commodity which a customer purchases in the store, a store server to control the information terminal, and an electronic device which the customer oneself possesses and uses for inputting identification data of the commodity, the store server comprising: a communication device which performs transmission/reception of information with the information terminal and the electronic device, the information received from the information terminal including said identification data of a commodity for identifying the commodity which a customer purchases in the store, the information received from the electronic device including said identification data of the commodity being input by the customer and a registration request; a storage device to store a list of terminal identification data in which first terminal identification data unique to the information terminal is to be previously registered and second terminal identification data unique to the electronic device to be issued when the customer uses the electronic device is to be additionally registered upon reception of the registration request, and a shopping file in which information of the commodity to be identified by the identification data of the commodity is to be registered in association with any one of the first terminal identification data and the second terminal identification data; and a processor which issues, by transmission to the electronic device through the communication device, a respective terminal identification data to be temporarily used to the electronic device upon reception of the registration request from the electronic device and registers the respective terminal identification data as the second terminal identification data; when the first terminal identification data is received from the information terminal by the communication device, determines whether first terminal identification data coincident with the received first terminal identification data is registered in the list of the terminal identification data, when determining that the coincident first terminal identification data is registered in the list of the terminal identification data, creates the shopping file in association with the received first terminal identification data, when the second terminal identification data is received from the electronic device by the communication device, determines whether second terminal identification data coincident with the received second terminal identification data is registered in the list of the terminal identification data, and when determining that the coincident second terminal identification data is registered in the list of the terminal identification data, creates the shopping file in association with the received second terminal identification data. a communication device which performs transmission/reception of information with the information terminal and the electronic device, the information received from the information terminal including said identification data of a commodity for identifying the commodity which a customer purchases in the store, the information received from the electronic device including said identification data of the commodity being input by the customer and a registration request; a storage device to store a list of terminal identification data in which first terminal identification data unique to the information terminal is to be previously registered and second terminal identification data unique to the electronic device to be issued when the customer uses the electronic device is to be additionally registered upon reception of the registration request, and a shopping file in which information of the commodity to be identified by the identification data of the commodity is to be registered in association with any one of the first terminal identification data and the second terminal identification data; and a processor which issues, by transmission to the electronic device through the communication device, a respective terminal identification data to be temporarily used to the electronic device upon reception of the registration request from the electronic device and registers the respective terminal identification data as the second terminal identification data; when the first terminal identification data is received from the information terminal by the communication device, determines whether first terminal identification data coincident with the received first terminal identification data is registered in the list of the terminal identification data, when determining that the coincident first terminal identification data is registered in the list of the terminal identification data, creates the shopping file in association with the received first terminal identification data, when the second terminal identification data is received from the electronic device by the communication device, determines whether second terminal identification data coincident with the received second terminal identification data is registered in the list of the terminal identification data, and when determining that the coincident second terminal identification data is registered in the list of the terminal identification data, creates the shopping file in association with the received second terminal identification data.