The Data Overmind, called the Data Integration Thought Entity in the anime (情報統合思念体 Johō Tōgō Shinen-Tai) is a conglomerate of the sentient data organisms which supervise the part of the galaxy in which Earth is in. It is divided into five or more factions—Moderates, the Innovative, the Compromise, the Thinking party and the radical faction—which do not necessarily agree or even cooperate with each other on basic goals. In The Surprise, Ryoko Asakura said the entity was controlled by a consensus of conservatives "always trying to preserve the status quo".
It seeks to auto-evolve itself, and holds humanity in general, and Haruhi Suzumiya in particular, as the key to this. It became aware of Haruhi when she unleashed a massive data flare on Tanabata, year 0.
However, it is incapable of communicating directly with humans. It created a variety of Humanoid Interfaces, referred to as TFEIs, in order to facilitate communication with humans. There are "many" on Earth, and the currently-seen examples have different personality profiles. TFEIs can only relay information from their own faction.
It looks forward to seeing changes in their observation subject, but different factions have different ideas about whether such changes should be provoked.
Kyon is not fond of the Data Overmind, partly because of its indifference to Yuki Nagato's condition (it threatened to delete Yuki following The Disappearance, and showed indifference to her illness in The Surprise).
During The Disappearance, when Yuki altered the world, the Data Overmind did not exist during that timeframe.
Interactions with the Sky Canopy DominionEdit
The Data Overmind has limited interaction with another data entity, The Sky Canopy Dominion, described by Yuki as a "similar but separate" entity which exists in a different "place". There hadn't been any contact, because they felt that contact would not lead to any mutual understanding. Like the Data Overmind, it was interested in Suzumiya.
The first interaction occurred in Snow Mountain Syndrome, where the Dominion, in an attempt to learn about Yuki, placed her and the rest of the SOS Brigade into a scenario where Yuki could not use her powers to escape. In response, the Data Overmind caused her to fall "ill" so she would not understand what the Data Overmind was trying to convey. This prevented the Dominion from learning from her.
Yuki noted that it had taken quite a long time (based on the limited communication in that incident) for the Data Overmind to even learn the Dominion's name. (The entity had previously named it the "Macrospatial Quantum Cosmic Existence").
She believed they could create a humanoid interface and then learn about Haruhi, or even communicate with other interfaces through speech.
By The Disappearance the Dominion created an interface known as Kuyou Suou. Later Ryoko Asakura was dispatched to prevent it from approaching Kyon. Meanwhile, it's attempts to communicate with Yuki rendered her "ill" again.
Data Overmind Humanoid Interfaces