Yes and no. Cybermen travel all over the universe, converting any and all lifeforms they can (and "deleting" any that they can't). So while some Cybermen USED to be human, not all Cybermen were (unless you count the ones from the alternate world in Season 2, since they began on Earth and had not yet had time to expand to other planets). They're similar to the Borg from Star Trek, if that helps.
cybermen
Some of the Cybermen were humans who had a special implant that cut their emotions. The human brains were removed painfully and then put in steel suits. However some Cybermen were alien robots.
The Tomb of the Cybermen was created in 1997.
Revenge of the Cybermen happened on 1975-05-10.
Attack of the Cybermen happened on 1985-01-12.
Cybermen returned in episode 12 of season 7, 'Nightmare in Silver'.
Daleks: 20 Cybermen: 13 The Daleks
Yes, Cybermen do speak. They all speak robotic-ly and of the same tone.
The Cybermen have appeared in the following episodes (including the parallel, Pete's World Cybermen, but not including spin-off shows like Torchwood or audio plays, comic strips, etc.): The Tenth Planet The Moonbase The Tomb of the Cybermen The Wheel in Space The Invasion The War Games (thought projection; cameo) The Mind of Evil (hallucination; archival photo) Carnival of Monsters (again, just a cameo) Revenge of the Cybermen Logopolis (flashback) The Five Doctors Attack of the Cybermen Silver Nemesis Dalek (the displayed head) Parallel: Rise of the Cybermen The Age of Steel Army of Ghosts Human Nature (flashback) The Sound of Drums (flashback) The Next Doctor The Eleventh Hour (hologram) The Pandorica Opens The Big Bang (turned to stone) So, that's 23 appearances in episodes of Doctor Who.
Cybermen - 2009 V is rated/received certificates of: UK:PG
Cybermen from doctor who are not real. Although in the programme they used human brains, with the emotions taken out, put in a metal case
probaly k9 with all his lazors but then again cybermen have lazors