A control device arranged to control an analyzing device or a processing device by using an application performing control for causing a GUI image including a plurality of GUI components to be displayed on a display screen of a display unit, the control device comprising: a GUI display control unit configured to perform control for causing the GUI image to be displayed on the display screen, wherein the functions of the GUI display control unit are implemented by the application performing control; a viewing unit configured to perform control for causing an electronic manual for the analyzing device or for the processing device to be displayed on the display screen; a GUI component designation information receiving unit configured to receive GUI component designation information used for designating a GUI component among the GUI components, the GUI component designation information having been output from the viewing unit when the GUI component designation information receiving unit has determined that an operation of selecting a GUI component name displayed on the electronic manual has been performed, the GUI component name corresponding to a GUI component; a position information acquiring unit configured to identify the GUI component designated on the basis of the GUI component designation information and acquire position information indicating a position of the identified GUI component on the GUI image from an operation system; and an emphasizing image display control unit configured to perform control for causing an image for emphasizing the identified GUI component to be displayed on the GUI image on the basis of the position information, the image for emphasizing the identified GUI component being a semi-transparent window to be displayed in a superimposed manner on the GUI image, a portion of the semi-transparent window overlapping the identified GUI component being lighter than a portion of the semi-transparent window not overlapping the identified GUI component, and the GUI component designation information receiving unit configured to perform control for causing a transparent window to be displayed on the GUI image when the GUI component designation information receiving unit has determined that the operation of selecting a GUI component name has not been performed. a GUI display control unit configured to perform control for causing the GUI image to be displayed on the display screen, wherein the functions of the GUI display control unit are implemented by the application performing control; a viewing unit configured to perform control for causing an electronic manual for the analyzing device or for the processing device to be displayed on the display screen; a GUI component designation information receiving unit configured to receive GUI component designation information used for designating a GUI component among the GUI components, the GUI component designation information having been output from the viewing unit when the GUI component designation information receiving unit has determined that an operation of selecting a GUI component name displayed on the electronic manual has been performed, the GUI component name corresponding to a GUI component; a position information acquiring unit configured to identify the GUI component designated on the basis of the GUI component designation information and acquire position information indicating a position of the identified GUI component on the GUI image from an operation system; and an emphasizing image display control unit configured to perform control for causing an image for emphasizing the identified GUI component to be displayed on the GUI image on the basis of the position information, the image for emphasizing the identified GUI component being a semi-transparent window to be displayed in a superimposed manner on the GUI image, a portion of the semi-transparent window overlapping the identified GUI component being lighter than a portion of the semi-transparent window not overlapping the identified GUI component, and the GUI component designation information receiving unit configured to perform control for causing a transparent window to be displayed on the GUI image when the GUI component designation information receiving unit has determined that the operation of selecting a GUI component name has not been performed.