1. A video monitoring method for a video monitoring system including a first obtaining unit, a second obtaining unit, a camera, a first plurality of image-capturing units, a second plurality of image-capturing units, a first processing unit, a second processing unit, and a display unit, comprising: obtaining, by the first obtaining unit, first identification information of a target person, from a recording medium associated with the target person, entering a predetermined area; capturing, by the camera, a face image of the target person; capturing, by the first plurality of image-capturing units, images of a first division area; capturing, by the second plurality of image-capturing units, images of a second division area, wherein the first plurality of image-capturing units and the second plurality of image-capturing units capture images from opposite directions of an area division line interposed between the first division area and the second division area; identifying, by the first processing unit, the target person who has not yet reached the target position at a certain specified time on a first basis of the first identification information of the target person obtained by the first obtaining unit and the second identification information of the target person obtained by the second obtaining unit; identifying, by the second processing unit, an image-capturing unit from the first plurality of image-capturing units that captured a newer image of a person considered to be the target person identified by the first processing unit and a shooting time, on a second basis of a feature quantity of the face image captured by the camera of the target person identified by the first processing unit and a feature quantity of the face image of the person included in a video captured in the first division area by the image-capturing unit; and displaying, by the display unit, a map of the predetermined area, the face image of the person considered to be the target person on a third basis of the second image-capturing unit, the shooting time identified by the first processing unit, and the face image of the target person captured by the camera, wherein, when the second processing unit identifies second image-capturing units of the plurality of the second image-capturing units that captured newer images of the person considered to be the target person, the display unit displays a plurality of the face images of the person in a division area of the map where the person is considered to be located, respectively, and wherein the display unit changes a degree of emphasis of the face image in the division area of the map where the person is considered to be located in accordance with a degree of similarity of the similar face image search performed by the second processing unit and the shooting time.