To make securable security with a simple constitution by providing a monitoring camera for reading merchandise information by a customer utilizing a self-registering terminal and a monitor camera for confirming and monitoring settling processing operation in the neighborhood of a self-registering terminal.

Plural self-operable POS terminals 12 are installed at a counter in a convenience store 1, and a computer 10 for a general manager and a manager provided with a settling function is installed in the back yard 2 of the convenience store. Then, at least one of POS terminals is made a self-registering terminal which can be switched to a self-registering mode which can be operated by not only a store clerk but also a customer him/herself. Also, monitor cameras 20 and sensors 30 for confirming and monitoring the existence of a customer utilizing the self-registering terminal are provided in the neighborhood of a cashier in the store 1. At least one of the cameras 20 normally share and monitor the entire of the store 1 and when the self-register terminal is switched to a self-registering mode, the camera is switched to a self-registering mode for monitoring the self-registering operation by a customer.