How to to import Excel into SQL Server without duplicates?

I have to upload Excel data into SQL Server. That data how to check and insert into previous table.

For example, previous table:

id name address  
1 mohan chennai  
2 raja madurai  

Excel data

id name address  
1 ram covai  
2 mohan chennai  

In this case I should only update ram into previous table, because mohan is already available in database table.