MONITORING DEVICE, MONITORING SYSTEM, MONITORING METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM STORING PROGRAM

Provided is a novel technology with which the occurrence of an abnormal situation can be detected and the abnormal situation can be appropriately ascertained. A monitoring device (1) comprises: a voice acquisition unit (2) that acquires prescribed speech spoken by a person due to the occurrence of an abnormal situation in a monitoring target area; a person identification unit (3) that identifies the person who spoke the prescribed speech, on the basis of a feature obtained from the prescribed speech; an analysis unit (4) that searches for the identified person in the images from a camera which images the monitoring target area, and that analyzes an expression or action of the person; and an abnormal situation evaluation unit (5) that evaluates the abnormal situation in the monitoring target area, on the basis of the analysis results.