A display controller controls a display device provided for a mobile object to display a display image including at least one item of contents of data. The display controller includes an image data acquisition unit configured to obtain image data from an imaging device configured to capture an image around the mobile object, and a display-image generation unit configured to generate the display image. The display-image generation unit changes a display mode of the at least one item of contents of data included in the display image to increase visual recognizability of a desired item of contents of data included in the at least one item of contents of data to a level at least higher than visual recognizability of an area in the image data not including the desired item of contents of data.