Stay management apparatus, stay management method, non-transitory computer-readable medium storing program, and stay management system

A stay management apparatus includes a registration unit for acquiring a face image of a visitor and to register the face image, an entry control unit for authenticating the visitor based on authentication target information that is associated with identification information of the visitor and to permit entry of the visitor, an acquisition unit for acquiring destination information, about inside the building, which is associated with the identification information of the visitor, a determination unit for determining a permitted stay duration of the visitor inside the building based on the destination information, a detection unit for detecting stay of the visitor by face authentication, based on monitor images that are sequentially captured, and an output unit for outputting an alert when stay of the visitor is detected by the face authentication after a lapse of the permitted stay duration.