An information processing system comprising: a first interface configured to acquire information including face information of a visitor; a first processor configured to execute face authentication between the face information of the visitor included in the information acquired by the first interface and registered face information of each of members registered in a membership database, and to store, in a visitor database, registered information of a member corresponding to the registered face information which was successfully authenticated with the face information of the visitor, in association with the face information of the visitor; wherein said information processing system further comprises: a second interface configured to acquire information including face information of a person of settlement; and a settlement terminal configured to execute a settlement of an amount of money and comprising a second processor configured to execute face authentication between the face information of said person of settlement included in the information acquired by the second interface and the face information of the visitor which the visitor database stores, and to execute a settlement process by using the registered information of the member corresponding to the face information of the visitor which was successfully authenticated with the face information of the person of settlement, characterized in that the first interface comprises a camera I/F for a connection to a first camera that is disposed near the entrance of the store and configured to photograph the face of the visitor; and the second interface comprises a camera I/F for a connection to a second camera that is disposed near the entrance of the settlement corner and configured to photograph the face of the person of settlement. a first interface configured to acquire information including face information of a visitor; a first processor configured to execute face authentication between the face information of the visitor included in the information acquired by the first interface and registered face information of each of members registered in a membership database, and to store, in a visitor database, registered information of a member corresponding to the registered face information which was successfully authenticated with the face information of the visitor, in association with the face information of the visitor; a second interface configured to acquire information including face information of a person of settlement; and a settlement terminal configured to execute a settlement of an amount of money and comprising a second processor configured to execute face authentication between the face information of said person of settlement included in the information acquired by the second interface and the face information of the visitor which the visitor database stores, and to execute a settlement process by using the registered information of the member corresponding to the face information of the visitor which was successfully authenticated with the face information of the person of settlement, characterized in that the first interface comprises a camera I/F for a connection to a first camera that is disposed near the entrance of the store and configured to photograph the face of the visitor; and the second interface comprises a camera I/F for a connection to a second camera that is disposed near the entrance of the settlement corner and configured to photograph the face of the person of settlement.