You can use apache or nginix webservers to deploy openerp on server. Please check blog. This blog basiclly describe how t deploy on apache webserver. 

I think OpenERP contains a webserver, doesn't it? You'll just have to make the port used by it to be accessable from the outside world or direct it to use a port that can be accessed from outside. How exactly this i done I don't know though

OpenERP already has its web server, but for a production server you will need a reverse-proxy like nginx to do the job. Google for nginex openerp and you will find instructions on how to set it up