To reproduce sound generated by considering a time difference between a time when the sound is recorded and a time when written data are obtained.

This synchronized input/output terminal system is provided with: a sound input device 5 for inputting sound; a coordinate information input device 3 for inputting coordinate information of an image recorded in a recording medium; a synchronized input/output terminal 4 equipped with a storage means for storing sound data representing the sound inputted by the sound input device 2 and the coordinate information inputted by the coordinate information input device 3 along with time, and a position input means 41 for inputting the position of the image; and a sound output device 5 for outputting the sound data based on the position inputted by the position input means 41. The synchronized input/output terminal 4 is equipped with a control means for controlling the sound output device 5 so as to output sound data by a predetermined period before the sound data corresponding to the position of the image inputted by the position input means 41 when the sound data is outputted by the sound output device 5.