1. An information processing system comprising: circuitry configured to acquire image data corresponding to a target object that is a target for gesture recognition captured by an imaging device; detect the target object in the acquired image data; determine motion information corresponding to the target object based on a region corresponding to the detected target object; determine whether a distance between the target object and the imaging device is inadequate for recognition of a gesture made by the target object based on the determined motion information; and output a notification when the determining determines that the distance between the target object and the imaging device is inadequate for recognition of a gesture made by the target object.