A display device comprising: a first substantially flat display having two opposing edges; a second display having a first part that extends from and is connected to one of the two opposing edges of the first display and a second part that extends from and is connected to the other of the two opposing edges of the first display, each of the first and second parts (D21,D22) having a curved surface which is bent at the boundary with the first display and configured to extend the whole display so that a user is able to perform a touch operation on the second display with their thumb whilst holding the display device by hand; and characterized by: a controller configured to control a screen of at least one of the first and second displays (D1,D2) based on a touch characteristic that comprises a combination of touch inputs of the first and second displays (D1,D2), and to generate an event according to the touch characteristic, wherein if the touch characteristic is a drag of the second display in a text input mode, the controller is further configured to output a character search user interface to the first display and rotate vowels through the character search user interface according to an up and down drag of the second display and rotate consonants through the character search user interface according to a left and right drag of the second display. a first substantially flat display having two opposing edges; a second display having a first part that extends from and is connected to one of the two opposing edges of the first display and a second part that extends from and is connected to the other of the two opposing edges of the first display, each of the first and second parts (D21,D22) having a curved surface which is bent at the boundary with the first display and configured to extend the whole display so that a user is able to perform a touch operation on the second display with their thumb whilst holding the display device by hand; and characterized by: a controller configured to control a screen of at least one of the first and second displays (D1,D2) based on a touch characteristic that comprises a combination of touch inputs of the first and second displays (D1,D2), and to generate an event according to the touch characteristic, wherein if the touch characteristic is a drag of the second display in a text input mode, the controller is further configured to output a character search user interface to the first display and rotate vowels through the character search user interface according to an up and down drag of the second display and rotate consonants through the character search user interface according to a left and right drag of the second display. a controller configured to control a screen of at least one of the first and second displays (D1,D2) based on a touch characteristic that comprises a combination of touch inputs of the first and second displays (D1,D2), and to generate an event according to the touch characteristic, wherein if the touch characteristic is a drag of the second display in a text input mode, the controller is further configured to output a character search user interface to the first display and rotate vowels through the character search user interface according to an up and down drag of the second display and rotate consonants through the character search user interface according to a left and right drag of the second display.