A mobile terminal system, comprising: a first mobile terminal including a first transparent display, a first sensing unit, and a first processor; a second mobile terminal including a second transparent display, a second sensing unit, and a second processor; wherein at least one of the first sensing unit and the second sensing unit is configured to sense overlapping and spacing apart between the first transparent display and the second transparent display; and wherein the first processor is configured to display a first content on the first transparent display, and the second processor is configured to display a second content on the second transparent display, wherein the second content being displayed on the second transparent display is changed with respect to an overlapping level and a distance between the first transparent display and the second transparent display, the overlapping level and distance being sensed by the at least one of the first sensing unit and the second sensing unit, characterized in that, in case a first area of the first transparent display and a second area of the second transparent display overlap one another, the first processor and the second processor are further configured to display common information on at least one of the first area and the second area while maintaining displaying the first content on a non-overlapped area of the first transparent display and maintaining displaying the second content on a non-overlapped area of the second transparent display, wherein the common information is additional information associated with the first content and the second content. a first mobile terminal including a first transparent display, a first sensing unit, and a first processor; a second mobile terminal including a second transparent display, a second sensing unit, and a second processor; wherein at least one of the first sensing unit and the second sensing unit is configured to sense overlapping and spacing apart between the first transparent display and the second transparent display; and wherein the first processor is configured to display a first content on the first transparent display, and the second processor is configured to display a second content on the second transparent display, wherein the second content being displayed on the second transparent display is changed with respect to an overlapping level and a distance between the first transparent display and the second transparent display, the overlapping level and distance being sensed by the at least one of the first sensing unit and the second sensing unit, characterized in that, in case a first area of the first transparent display and a second area of the second transparent display overlap one another, the first processor and the second processor are further configured to display common information on at least one of the first area and the second area while maintaining displaying the first content on a non-overlapped area of the first transparent display and maintaining displaying the second content on a non-overlapped area of the second transparent display, wherein the common information is additional information associated with the first content and the second content.