A flexible display device comprising: a case; a display unit including a screen that can extend or retract from the case, wherein a home button is provided to the display unit; a sensing unit to detect a size of the screen when extended from the case; and a control unit coupled with the display unit and the sensing unit, wherein the control unit is configured to: cause the display unit to display a first information on a first area of the screen corresponding to a first distance of the screen in a state of not being extended, cause the display unit to display an indicator on the screen representing that a second information can be provided when the size of the screen is extended by an area corresponding to a second distance after the size of the screen is retracted by an area corresponding to a third distance, and cause the display unit to display the second information related to the first information on a second area of the screen corresponding to the second distance of the screen if the screen is extended out corresponding to the second distance, characterized in that the control unit is further configured to: cause the display unit while displaying the first information and the second information to enlarge the first information if a request for selecting the home button is received and it is detected that the screen is further extended so that the enlarged first information fit the extended area, cause the display unit while displaying the first information and the second information to enlarge the second information if the request for selecting the home button is not received and it is detected that the screen is further extended so that the enlarged second information fit the extended area. a case; a display unit including a screen that can extend or retract from the case, wherein a home button is provided to the display unit; a sensing unit to detect a size of the screen when extended from the case; and a control unit coupled with the display unit and the sensing unit, wherein the control unit is configured to: cause the display unit to display a first information on a first area of the screen corresponding to a first distance of the screen in a state of not being extended, cause the display unit to display an indicator on the screen representing that a second information can be provided when the size of the screen is extended by an area corresponding to a second distance after the size of the screen is retracted by an area corresponding to a third distance, and cause the display unit to display the second information related to the first information on a second area of the screen corresponding to the second distance of the screen if the screen is extended out corresponding to the second distance, characterized in that the control unit is further configured to: cause the display unit while displaying the first information and the second information to enlarge the first information if a request for selecting the home button is received and it is detected that the screen is further extended so that the enlarged first information fit the extended area, cause the display unit while displaying the first information and the second information to enlarge the second information if the request for selecting the home button is not received and it is detected that the screen is further extended so that the enlarged second information fit the extended area. cause the display unit to display a first information on a first area of the screen corresponding to a first distance of the screen in a state of not being extended, cause the display unit to display an indicator on the screen representing that a second information can be provided when the size of the screen is extended by an area corresponding to a second distance after the size of the screen is retracted by an area corresponding to a third distance, and cause the display unit to display the second information related to the first information on a second area of the screen corresponding to the second distance of the screen if the screen is extended out corresponding to the second distance, cause the display unit while displaying the first information and the second information to enlarge the first information if a request for selecting the home button is received and it is detected that the screen is further extended so that the enlarged first information fit the extended area, cause the display unit while displaying the first information and the second information to enlarge the second information if the request for selecting the home button is not received and it is detected that the screen is further extended so that the enlarged second information fit the extended area.