An information processing system includes one or more information processing devices and controls bidirectional communication of image data and audio data between a first information terminal used by a first user and a second information terminal used by a second user. The information processing system includes a calculation unit analyzing the image data and the audio data on the second user received from the second information terminal and calculating difference information that indicates a difference between a current state and a past state of the second user; an image generation unit superimposing the difference information on the image data received from the second information terminal, such that the difference information is displayed around a field where an image of the second user is placed; and a transmission unit transmitting, to the first information terminal, the image data on which the difference information is superimposed and the audio data.
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