An information processing system includes first and second information processing apparatuses. The first information processing apparatus includes a first display controller. The first display controller performs control to display a parent message and a child message on a first display. The second information processing apparatus includes a second display controller and a receiver. The second display controller performs control to display a file attached to a parent message and a sticky note which shows the content of a child message on a second display. The receiver receives a file attached to a parent message and a child message from the first information processing apparatus. When the receiver has received the file and the child message, the second display controller performs control to display a sticky note which shows the content of the child message on the second display such that the sticky note is superposed on the file.