Blogger and unicode?

I can't see your code Kotaro ,

but any code can added to blogger and and by default embedding font in web is not available . but you can use CSS 3.0 to force user to use from the font you like, this css property is font-url

and you can use it as any other css property like

  <div style="direction:ltr;text-align:left;font-size:small;font-url:('../resources/fonts/YourFont.ttf');"> you code </div>

just note that this CSS property just available at css 3.0 and now just Firefox 3.5 supports it so I recommand you Ignore it for now,

if you want to show a speciall text just use from a font that you know your users have it, like (Arial , Tahoma , Verdana ) for windows usres

for code you can use these software

1- copysourceashtml http://copysourceashtml.codeplex.com/

that is a opensource software

copysourceashtml http://i3.codeplex.com/Project/Download/FileDownload.aspx?ProjectName=copysourceashtml&DownloadId=78099

2- Postable http://vahid.nasiri.googlepages.com/postable.rar