Information processing device, information processing system, and information processing method

There is provided an information processing device for realizing interactive viewing in which a plurality of users thereof share an image, and an operation performed on the image by any user among the plurality of users is shown in real time on the image viewed by another user. A plurality of information processing devices ( 2 ) and ( 3 ) belonging to a same group respectively transmit, to a server ( 4 ), image information respectively stored in the devices ( 2 ) and ( 3 ). The server ( 4 ) collects and manages images transmitted from the plurality of information processing devices ( 2 ) and ( 3 ), and concurrently transmits, to the plurality of information processing devices ( 2 ) and ( 3 ), a shared image in accordance with an image operation requested from any of the information processing devices ( 2 ) and ( 3 ). The information processing devices ( 2 ) and ( 3 ) receive the shared image transmitted from the server ( 4 ), and display the shared image on the display sections ( 26 ) and ( 36 ), respectively.