Anubis does not have a host at any point when we see him in SG-1 (excepting when he possess a human after the Season 7 finale).
His human host at the time of ascension would not have been carried upwards with him simply because Anubis ascended. That said, Anubis wanted to keep Oma thinking he was good, and Oma IS good, so it's unlikely that Anubis' host was killed.
In my mind, it's much more likely that Oma was convinced (in part) because Anubis had either allowed his host freedom (a la Tokra) and they BOTH were taught to ascend, or the human host Anubis took had no individual personality (brain dead, etc).
If Anubis allowed the host freedom, the host would have known the symbiote's thoughts and warned Oma (unless Anubis could convince him not to, which is possible). Therefore, it's very unlikely that the host and symbiote shared ascension.
Thus, I believe that when Anubis ascended his host's body, freed of his influence, lived on. The original personality would have re-emerged. The host would have lived a long, full life (or been shot dead by Jaffa shortly thereafter).