1. A display control device which displays images used for retrieving a piece of content data among a plurality of pieces of content data on a display unit, the display control device comprising: a retrieval image generation unit configured to generate images used in a retrieval operation which include retrieval condition images and item images arranged on a plane by arranging the retrieval condition images which indicate a plurality of retrieval conditions for the plurality of pieces of content data in a first direction on a plane, and by arranging, in a second direction, the item images which indicate pieces of content data or folders including pieces of content data categorized on the basis of the retrieval conditions represented by the retrieval condition images arranged in the first direction; and a retrieval image display control unit configured to display the images used in a retrieval operation generated using the retrieval image generation unit on the display unit, configured to detect an operation input, and configured to move an indicator, which is used for indicating a selected one of the retrieval condition images and the item images, in a vertical direction or a horizontal direction in accordance with the detected operation input.