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If the settings on your NIC on the VM is set to Bridged then access from one to the other should be available.<br />
Check firewall settings on CentOS to see if there are settings that prevent access to Apache Web Console.<br />
<br />
Hope the above helps.
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In this way i can only access internet on operating system because internet connection is captive portal.<br />
<br />
When I have selected NAT as network type, i can access internet on both operating system. I can ping from guest OS to host OS but not from Host to Guest
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On a test environment, I have installed CentOS on a VirtualBox and set up a websever.<br />
<br />
My host operating system has IIS (windows xp sp2) installed and guest (centos) has Apache.<br />
<br />
From CentOs, I can browse IIS website. <br />
<br />
I would like to open the Apache website from Host machine (windows xp sp2)<br />
<br />
The guest OS has private ip address 10.0.2.15 and Host machine has public ip address (183.82.x.x)<br />
<br />
How could I make this possible?
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On a test environment, I have installed CentOS on a VirtualBox and set up a websever.

My host operating system has IIS (windows xp sp2) installed and guest (centos) has Apache.

From CentOs, I can browse IIS website. 

I would like to open the Apache website from Host machine (windows xp sp2)

The guest OS has private ip address 10.0.2.15 and Host machine has public ip address (183.82.x.x)

How could I make this possible?

If the settings on your NIC on the VM is set to Bridged then access from one to the other should be available.
Check firewall settings on CentOS to see if there are settings that prevent access to Apache Web Console.

Hope the above helps.

In this way i can only access internet on operating system because internet connection is captive portal.

When I have selected NAT as network type, i can access internet on both operating system. I can ping from guest OS to host OS but not from Host to Guest

Open webpage hosted on guest operating system

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.

Apache Web Server

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).