Provided is a screen display server capable of widely providing a client terminal without special hardware or the like with an effect of reducing power consumption related to screen display. The screen display server (30) acquires the display mode of the display unit of the terminal when a screen acquisition request is received from the client terminal. Next, an image type relating to the least power consumption of the display when displayed on a display unit of a previous display method is selected from a plurality of predetermined types of image types, and display data of the requested screen is generated using the selected image type and provided to the client terminal. For example, if the terminal is in a normally-white mode, a screen with high average brightness is provided by arranging operation buttons of a gray system in a background of the white system, and if the terminal is in the normally-black mode, a screen with low average brightness is provided by arranging operation buttons of the white system in the background of the gray system.