A display device comprising: a display unit that displays an operation screen in which a plurality of icons, each associated with a predetermined function and representing an image indicating the function associated with the icon, are arranged; a display control unit that controls a displaying operation of the display unit; a reception unit that receives an operation inputted through the operation screen; and a processing unit that executes the operation received by the reception unit, characterized in that the display control unit is configured to (i) enlarge the icon when the reception unit receives a predetermined operation with respect to the icon, (ii) generate, when respective allocated areas of at least two icons overlap owing to the enlarging of the icon, a synthesized icon including a first region (S1, S4) and a second region (S2, S5) where the allocated areas are not overlapping and a third region (S3, S8) where the allocated areas overlap, and representing, in the third region (S3, S8), a synthesized image generated according to a plurality of images represented by the at least two icons, and (iii) cause the display unit to display the synthesized icon generated, and the processing unit is configured to (i) execute the function associated with the icon shown in the first region (S1, S4) or the second region (S2, S5), when the reception unit receives an operation of selecting a point in the first region (S1, S4) or the second region (S2, S5) of the synthesized icon, and (ii) execute, when the reception unit receives a slide operation starting from a point in the third region (S3, S8) of the synthesized icon, the function associated with the icon displayed at an end point of the slide operation, out of the functions respectively associated with the at least two icons. a display unit that displays an operation screen in which a plurality of icons, each associated with a predetermined function and representing an image indicating the function associated with the icon, are arranged; a display control unit that controls a displaying operation of the display unit; a reception unit that receives an operation inputted through the operation screen; and a processing unit that executes the operation received by the reception unit, characterized in that the display control unit is configured to (i) enlarge the icon when the reception unit receives a predetermined operation with respect to the icon, (ii) generate, when respective allocated areas of at least two icons overlap owing to the enlarging of the icon, a synthesized icon including a first region (S1, S4) and a second region (S2, S5) where the allocated areas are not overlapping and a third region (S3, S8) where the allocated areas overlap, and representing, in the third region (S3, S8), a synthesized image generated according to a plurality of images represented by the at least two icons, and (iii) cause the display unit to display the synthesized icon generated, and the processing unit is configured to (i) execute the function associated with the icon shown in the first region (S1, S4) or the second region (S2, S5), when the reception unit receives an operation of selecting a point in the first region (S1, S4) or the second region (S2, S5) of the synthesized icon, and (ii) execute, when the reception unit receives a slide operation starting from a point in the third region (S3, S8) of the synthesized icon, the function associated with the icon displayed at an end point of the slide operation, out of the functions respectively associated with the at least two icons.