Monitoring system and program

The subject of the present disclosure is to make an appropriate notification in accordance with the state of a subject. A monitoring system (1) is provided with an arithmetic processing unit (30). An arithmetic processing unit (30) inputs imaging information indicating a captured image obtained by imaging a subject (100), and generates notification information indicating specifying notification content corresponding to the state of the subject (100). The arithmetic processing unit (30) is provided with a first arithmetic processing unit (301) and a second arithmetic processing unit (302). The first arithmetic processing unit (301) obtains a state quantity in which the state of the subject (100) is quantified on the basis of parameters relating to the activity state of the person on the basis of the imaging information. A second arithmetic processing unit (302) selects and specifies the notification content in accordance with the state quantity from among the notification content classified into N stages (N is