Ahead mounted display, HMD, device, comprising: a communication unit configured to perform communication with a mobile terminal; a display; and a controller configured to: cause the display to display a first region of virtual space content corresponding to a front view of a wearer of the HMD device, wherein the virtual space content is received from the mobile terminal; cause the display to display an image object in the first region, wherein the image object is for generating a command for a command input region, wherein the command input region is a region including one or more input components and capable of entering a control command or text or selecting a function through the one or more input components, wherein the one or more input components comprises at least one of a keypad, a selection window, and a control menu, for entering the control command, text or selecting the function; cause the image object to move according to the wearer's head gesture while the command input region is displayed in the first region; when the command input region disappears, cause the image object to be fixed to the first region in response to the region of the virtual content displayed on the display being switched from the first region to a second region according to the wearer's head gesture; and store information related to a position of the first region to which the image object is displayed and a position of the image object in the first region to the memory; and wherein the controller is further configured to cause the display to display an image corresponding to a part of the first region including the object in the second region in a picture-in-picture, PIP, format based on the stored information in a picture-in-picture, PIP, format, in response to a predetermined input. a communication unit configured to perform communication with a mobile terminal; a display; and a controller configured to: cause the display to display a first region of virtual space content corresponding to a front view of a wearer of the HMD device, wherein the virtual space content is received from the mobile terminal; cause the display to display an image object in the first region, wherein the image object is for generating a command for a command input region, wherein the command input region is a region including one or more input components and capable of entering a control command or text or selecting a function through the one or more input components, wherein the one or more input components comprises at least one of a keypad, a selection window, and a control menu, for entering the control command, text or selecting the function; cause the image object to move according to the wearer's head gesture while the command input region is displayed in the first region; when the command input region disappears, cause the image object to be fixed to the first region in response to the region of the virtual content displayed on the display being switched from the first region to a second region according to the wearer's head gesture; and store information related to a position of the first region to which the image object is displayed and a position of the image object in the first region to the memory; and wherein the controller is further configured to cause the display to display an image corresponding to a part of the first region including the object in the second region in a picture-in-picture, PIP, format based on the stored information in a picture-in-picture, PIP, format, in response to a predetermined input. cause the display to display a first region of virtual space content corresponding to a front view of a wearer of the HMD device, wherein the virtual space content is received from the mobile terminal; cause the display to display an image object in the first region, wherein the image object is for generating a command for a command input region, wherein the command input region is a region including one or more input components and capable of entering a control command or text or selecting a function through the one or more input components, wherein the one or more input components comprises at least one of a keypad, a selection window, and a control menu, for entering the control command, text or selecting the function; cause the image object to move according to the wearer's head gesture while the command input region is displayed in the first region; when the command input region disappears, cause the image object to be fixed to the first region in response to the region of the virtual content displayed on the display being switched from the first region to a second region according to the wearer's head gesture; and store information related to a position of the first region to which the image object is displayed and a position of the image object in the first region to the memory; and wherein the controller is further configured to cause the display to display an image corresponding to a part of the first region including the object in the second region in a picture-in-picture, PIP, format based on the stored information in a picture-in-picture, PIP, format, in response to a predetermined input.