Display control apparatus, the distribution apparatus, display control method and a display control system,

To change the aspect ratio adaptively. Reproducing apparatus (200), the aspect ratio and the base region, with reference to the MPD data (221) that defines a plurality of adjacent regions to each other shapes different adjacent to the basic area, to identify adjacent regions combined with the basic area changing section (212), and a player for the basic area and the display target area of ​​a combination of a specified said adjacent area (213).