PURPOSE: A display device and a control method thereof are provided to selectively supply manual information images according to a function familiarity level of users by displaying the manual information image corresponding to the level of the user relative to a first function. CONSTITUTION: A controller (160) determines a user level corresponding to a first function based on user level information stored in a storage unit (150) when a display event of a manual image relative to a first function among one or more functions is generated. The controller displays the manual image composed by one or more manual information corresponding to a determined user level among a plurality of manual information stored in the storage unit corresponding to the first function. [Reference numerals] (110) Image receiving unit; (120) Image processing unit; (130) Display unit; (140) User input unit; (150) Storage; (160) Control unit
