How to input unicode character set from oralce form 9i

Hi,
Can anyone show me how to input unicode character set from form 9i. I have designed a form and run it but when I input unicode charater in TEXT ITEM on form (FONT_NAME of this TEXT ITEM is New Roman, AriaTime l ...), but it display incorrectly nor stored it in Database.
Thank you !

Thank Duncan R Mills !
My setting NLS_CHARACTER in Database as follow :
SQL> SELECT * FROM NLS_DATABASE_PARAMETERS;
PARAMETER VALUE
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET UTF8
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
PARAMETER VALUE
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZH:TZM
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZH:TZM
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_NCHAR_CHARACTERSET UTF8
NLS_RDBMS_VERSION 8.1.7.0.0
18 rows selected.
Even if I can'nt input unicode character on Oracle Forms, It display incorrectly though I set exactly font_name.

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