/lib/visit.lib.php의 os부분을 아래걸로 교체해주시면 됩니다.

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function get_os($agent)
{
    $agent = strtolower($agent);

    //echo $agent; echo "<br/>";

    if (preg_match("/windows 98/", $agent))                 { $s = "98"; }
    else if(preg_match("/iphone/", $agent))                 { $s = "iPhone"; } //iPhone
    else if(preg_match("/ipad/", $agent))                   { $s = "iPad"; } //iPad
    else if(preg_match("/iPod/", $agent))                   { $s = "iPod"; } //iPod
    else if(preg_match("/android/", $agent))                { $s = "Android"; } //Android
    else if(preg_match("/psp/", $agent))                    { $s = "PSP"; } //PSP
    else if(preg_match("/playstation/", $agent))            { $s = "PLAYSTATION"; } //PLAYSTATION
    else if(preg_match("/berry/", $agent))                  { $s = "BlackBerry"; } //BlackBerry
    else if(preg_match("/symbian/", $agent))                { $s = "Symbian"; } //Symbian
    else if(preg_match("/ericsson/", $agent))               { $s = "SonyEricsson"; } //SonyEricsson
    else if(preg_match("/nokia/", $agent))                  { $s = "Nokia"; } //Nokia
    else if(preg_match("/sph/", $agent))                    { $s = "애니콜"; } //삼성폰
    else if(preg_match("/sgh/", $agent))                    { $s = "옴니아"; } //옴니아
    else if(preg_match("/sch/", $agent))                    { $s = "T*옴니아"; } //T*옴니아
    else if(preg_match("/im-s/", $agent))                   { $s = "스카이폰"; } //스카이폰
    else if(preg_match("/lgtelecom/", $agent))              { $s = "LG 사이언"; } //LG 사이언
    else if(preg_match("/windows 95/", $agent))             { $s = "95"; }
    else if(preg_match("/windows nt 4\.[0-9]*/", $agent))   { $s = "NT"; }
    else if(preg_match("/windows nt 5\.0/", $agent))        { $s = "2000"; }
    else if(preg_match("/windows nt 5\.1/", $agent))        { $s = "XP"; }
    else if(preg_match("/windows nt 5\.2/", $agent))        { $s = "2003"; }
    else if(preg_match("/windows nt 6\.0/", $agent))        { $s = "Vista"; }
    else if(preg_match("/windows nt 6\.1/", $agent))        { $s = "Windows7"; }
    else if(preg_match("/windows 9x/", $agent))             { $s = "ME"; }
    else if(preg_match("/windows ce/", $agent))             { $s = "CE"; }
    else if(preg_match("/linux/", $agent))                  { $s = "Linux"; }
    else if(preg_match("/sunos/", $agent))                  { $s = "sunOS"; }
    else if(preg_match("/irix/", $agent))                   { $s = "IRIX"; }
    else if(preg_match("/phone/", $agent))                  { $s = "Phone"; }
    else if(preg_match("/bot|slurp/", $agent))              { $s = "Robot"; }
    else if(preg_match("/internet explorer/", $agent))      { $s = "IE"; }
    else if(preg_match("/mozilla/", $agent))                { $s = "Mozilla"; }
    else if(preg_match("/macintosh/", $agent))              { $s = "Mac"; }
    else { $s = "기타"; }

    return $s;
}
=====================================================================

USER_AGENT는 이곳을 참조하였습니다.
http://coffeenix.net/board_view.php?bd_code=1668

적용결과 대충 이정도로 나오네요.



아직 기타가 너무 많네요.
수정할 부분이나 기타 AGENT는 답변 부탁드립니다.(__)