The technical subject is realizing a highly useful input-output device which can be used alone to independently input and output information, and, when connected with an information processing device, can function as an input device that depends on the applications of the information processing device. The input-output device comprises: a function of recognizing whether a connection with the information processing device through a connection unit is present by the connection recognition unit and transmitting a code value and/or a coordinate value converted by a processing unit to the information processing device through the connection unit; and a function of outputting the content data from the output unit or controlling operation based on the operation instruction when the connection recognition unit does not recognise a connection between the connection unit and the information processing device. The provided functions make the disclosed input-output device highly useful.