1. A monitoring device comprising: an inputter configured to receive an input of a plurality of images captured at separate positions and a plurality of sound sources heard at separate positions; a saliency map generator configured to generate a plurality of mono saliency maps for each of the plurality of images and to generate a dynamic saliency map using the plurality of mono saliency maps generated; a position determinator configured to determine positions of the sound sources through analysis of the plurality of sound sources; a scan path recognizer configured to generate scan paths of the plurality of images based on the generated dynamic saliency map and the determined positions of the sound sources; and an outputter configured to output the generated scan paths.