Person Monitoring Device And Method, And Person Monitoring System

A subject observation method, comprising:

• a first detection step of detecting a predetermined movement of a subject to be observed;
• an abnormality determination step of determining based on the predetermined movement of the subject detected in the first detection step and a specified parameter whether or not the predetermined movement of the subject indicates an abnormality;
• a second detection step of detecting specified circumstances in connection with the specified parameter during a specified period;
• and
• a parameter setting step of obtaining a value of the specified parameter based on the specified circumstances detected in the second detection step during the specified period, the obtained value of the specified parameter being stored in a parameter information storage as the specified parameter to be used in the abnormality determination step.

A subject observation unit, comprising:

• a parameter information storage which stores a movement region of a subject to be observed as a specified parameter to be used for determination whether or not a predetermined movement of the subject indicates an abnormality;
• a first detector which detects the predetermined movement of the subject;
• and
• a hardware processor including an abnormality determination part which determines whether or not the predetermined movement of the subject indicates the abnormality, wherein
• the abnormality determination part determines the predetermined movement of the subject as indicating the abnormality when the first detector detects the predetermined movement of the subject and the subject locates within the movement region stored by the parameter information storage.