Provided are an information processing system, an information processing method and a program capable of suitably monitoring a moving body related to a plurality of imaging apparatuses. The information processing system of the present invention includes: an input unit 110 for receiving inputs of pictures imaged by a plurality of video cameras 200; a human figure detection unit 120 for detecting a moving body appearing in a picture input from the input unit 110 and imaged by a video camera 200A among the plurality of video cameras 200; a time prediction unit 140 for predicting a time period in which the moving body appears in a picture imaged by a video camera 200N, based on a time transition of a probability of the moving body, which is detected in the picture of the video camera 200A, appearing in the picture of the video camera 200N and a time passage after the moving body detected in the picture of the video camera 200A leaves an imaging range; and a UI generation unit 153 for providing a notice regarding a time period in which the moving body is predicted to appear in the picture of the video camera 200N.