how can I merge cell table in ireport?

Hi~

It's my first time using ireport..and version is 5.6

There is one main report and put one Table element.

The result of the DB Query is like below.

 But I want to see it like below.

if A column data is same, merge cell and put B column like below.

 Is there any way to merge cell??

Plz....help me..