Thanx for reply.
We are using Oracle DB. We are using DBD::Oracle driver and data type of column where these data is stores id NVARCHAR. 
Oracle NLS_NCHAR enviroment variable is AL16UTF16.

Japanese character are inserted into Sybase DB table by some other tachnology and DBI is used for sybase conenctivity.My script is fetching from Sybase table.But not Japanese character are stored into variable.So first I need to know why not actual Japanese character are fetched
?
Post this what should be done to store these Japanese character into Oracle?. 

Thanx,
Prafull