HTML FontFace working in safari not in stimulator and device

Hi, I have a HTML page which uses fontface for japanese font. It worked perfectly in browsers. when I checked on html5 mobile application in Appcelerator Titanuim, it failed in both Stimulator and Device. please guide me how to overcome this. my syntax is :

@font-face {
    font-family: 'Japanese';
    font-style: normal;
    font-weight: normal;
    src: local('Japanese'), url('css/Japanese.ttf') format('truetype');
    }
.Japanese {
    font-family: Japanese, sans-serif;
    }