A monitoring terminal device (2) is a device for monitoring users entering and exiting an area. A controller (14) specifies each user entering the area as a first monitoring target or a first non-monitoring target in a first entry image and a first exit image. The first entry image and the first exit image exhibit the same first monitoring target. The first entry image includes an image of at least one user entering the area (22). The first exit image includes an image of at least one user exiting the area. The controller (14) creates a second entry image by performing a first marking process on the first entry image. The controller (14) creates a second exit image by performing a second marking process on the first exit image. An image display section (18) displays at least one of the second entry image and the second exit image.