how to uploda excel file to internal table?

Hi Experts,

My requirnment is so simple. I need to upload excel file into internal table.

sadly it's hard to me...

I have to create user role data from excel file.

this is an excel form.

userid role1
rol2
...
role n user 01 role1 role2 ... role n user 02 role1 role2 ...
user ... role1 role2 ... role n user n role1 role2 ... role n

DATA : BEGIN OF rolename,

rolename(50) TYPE c,

END OF rolename.

DATA : BEGIN OF is_data,

uname(30) TYPE c,

role LIKE TABLE OF rolename,

END OF is_data,

it_data LIKE TABLE OF is_data.

I created this internal table. but i can't upload that excel file to internal table...

help me please.