서버 Apache/2.0.55 (Ubuntu) 입니다.

/etc/apache2/apache2.conf 에 httpd.conf,port.conf등을 인클루드하는 형태로 설정을 잡더군요.

질문의 요지는 하나의 ip:80 포트만 사용하여 두개의 도메인을 각각 다른 경로에 세팅해주는 방법입니다.

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설정 파일가운데 호스트 관련 부분은 아래 내용이 전부입니다.
/etc/apache2/sites-available/default

NameVirtualHost *
<VirtualHost *>
    ServerAdmin [email protected]
    DocumentRoot /home
    #SerName gaetgol.net
    #ServerAlias www.gaetgol.net
    <Directory />
        Options FollowSymLinks
        AllowOverride None
    </Directory>
    <Directory /home>
        Options Indexes FollowSymLinks MultiViews
        AllowOverride None
        Order allow,deny
        allow from all
        # Uncomment this directive is you want to see apache2's
        # default start page (in /apache2-default) when you go to /
        #RedirectMatch ^/$ /apache2-default/
    </Directory>

    ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
    <Directory "/usr/lib/cgi-bin">
        AllowOverride None
        Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
        Order allow,deny
        Allow from all
    </Directory>

    ErrorLog /var/log/apache2/error.log

    # Possible values include: debug, info, notice, warn, error, crit,
    # alert, emerg.
    LogLevel warn

    CustomLog /var/log/apache2/access.log combined
    ServerSignature On

    Alias /doc/ "/usr/share/doc/"
    <Directory "/usr/share/doc/">
        Options Indexes MultiViews FollowSymLinks
        AllowOverride None
        Order deny,allow
        Deny from all
        Allow from 127.0.0.0/255.0.0.0 ::1/128
    </Directory>

</VirtualHost>

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 # 사용자 디렉토리
 /etc/apache2/mods-enabled/userdir.conf
 
<IfModule mod_userdir.c>
         UserDir www
     UserDir disabled root
        
         <Directory /home/*/www>
                 AllowOverride FileInfo AuthConfig Limit
                 Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec
         </Directory>
 </IfModule>