An apparatus includes a memory, a processor, a control unit and an instruction unit. The control unit controls display on a display unit on which an image based on received image data is displayed. The instruction unit provides an instruction to switch a display size of the image on the display unit. When the instruction unit provides the instruction, in a state in which the image before the switching is performed is displayed on the display unit, the control unit causes display of a first object visually indicating a second display size of the image that is to be displayed on the display unit, the second display size being a size after the switching is performed, and, when the second display size is determined on the basis of the instruction from the instruction unit, the control unit causes display of the image based on the second display size.