One of the topical problems of ionospheric physics is the interconnection of different regions of the ionosphere. The paper studies interregional relations of changes in ionospheric dynamics by using a graph technology. Data of global ionospheric maps (GIM) on the total electron content (TEC) of CODE laboratory for 2005-2010 were used as information about the ionosphere. The distribution of the correlation functions maxima of TEC changes in the ionosphere is complicated and makes it possible to distinguish two levels of interrelation between the regions, they are: a strong relation (r >0.9) and weak relation (r >0.72). In the Northern Hemisphere, the ionosphere is characterized by a strong relation between the nodes of the Arctic region above the 50° of geomagnetic latitude. In the Southern Hemisphere, the area of strong relation is much larger. Weak relation is typical for the entire Southern Hemisphere. In the south of North America, there is an area, in which the TEC dynamics correlates at various nodes, and practically does not correlate with the dynamics of the rest of the ionosphere.