In an information processing system comprising footwear and an information processing device, the footwear is provided with a sensor to detect a motion of the footwear, the information processing system includes: a detection unit configured to detect the motion of the footwear on the basis of a temporal change of the sensing data; and a generation unit configured to generate space information to be provided to a user wearing the footwear according to the motion detected by the detection unit; and the information processing device is provided with an output unit configured to output the space information.