An electronic device (101, 501, 1301) comprising: a first display configured to display first content; a second display configured to slide on the first display, and display second content; and a processor configured to: display at least one piece of content related to at least one of the first content and the second content on at least one of the first display and the second display, according to overlap between the first display and the second display, incurred by sliding, wherein: when the second display has slid so as to overlap with the first display over a partial area, the processor is configured to display, in the partial area on the second display, guide information indicating a first direction and a second direction, and when the second display has slid in the first direction so as to overlap wholly with the first display or when the second display has slid in the second direction so as to decrease the partial area, the processor is configured to: execute, based on the sliding direction (1611, 1712), an application related to the second content, and display an execution screen (1681, 1771) of the application on at least one of the first display and the second display. a first display configured to display first content; a second display configured to slide on the first display, and display second content; and a processor configured to: display at least one piece of content related to at least one of the first content and the second content on at least one of the first display and the second display, according to overlap between the first display and the second display, incurred by sliding, wherein: when the second display has slid so as to overlap with the first display over a partial area, the processor is configured to display, in the partial area on the second display, guide information indicating a first direction and a second direction, and when the second display has slid in the first direction so as to overlap wholly with the first display or when the second display has slid in the second direction so as to decrease the partial area, the processor is configured to: execute, based on the sliding direction (1611, 1712), an application related to the second content, and display an execution screen (1681, 1771) of the application on at least one of the first display and the second display. when the second display has slid so as to overlap with the first display over a partial area, the processor is configured to display, in the partial area on the second display, guide information indicating a first direction and a second direction, and when the second display has slid in the first direction so as to overlap wholly with the first display or when the second display has slid in the second direction so as to decrease the partial area, the processor is configured to: execute, based on the sliding direction (1611, 1712), an application related to the second content, and display an execution screen (1681, 1771) of the application on at least one of the first display and the second display. execute, based on the sliding direction (1611, 1712), an application related to the second content, and display an execution screen (1681, 1771) of the application on at least one of the first display and the second display.