Comment 2 for bug 1514288

case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac

I found above lines at the .bashrc.
And the escape character, "\[\e]0;" does not work on Japanese(ISO-2022-JP) Encoding.