An information processing system comprising an information processing device and a portable terminal. The information processing device includes: a first wireless communication part that establishes wireless communication with the portable terminal; a screen controller that updates a screen displayed on a display part based on a user operation; a tag information storage that stores therein tag information which is sent to the portable terminal; and a tag information updating part that updates the tag information depending on the screen displayed on the display part. The portable terminal includes: a second wireless communication part that establishes wireless communication with the information processing device; and a controller that performs an operation depending on the screen displayed at the information processing device based on the tag information.