An information processing system has a portable information terminal and an information processing device that allow communication therebetween. The portable information terminal includes: a first application executing part for acquiring screen information indicating a screen with which a user makes remote operation from the information processing device and displaying the screen; and an informing part for sending access information as to a destination being accessed by a second application executing part to the information processing device when an application detecting part detects that both of the first and second application executing parts are running. The information processing device includes: a screen creating part for creating the screen based on the access information; and a transmitting part for sending the screen information created by the screen creating part to the portable information terminal. The first application executing part displays the screen based on the screen information received from the transmitting part.