Populating a people picker in infopath 2010 according to the username.

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SharePoint

InfoPath

Hi I have created an InfoPath 2010 form to retrieve some information. This form's data is retrieving using an AD. Now I want to populate the people picker with the users of the same group ex: students, doctors e.t.c that filtered using the given username.

When the user enters a username and a password the form will be populated itself with that username and password. According to that username the person picker should populate with the users of the same group. I have searched through the web to find a solution for that and could not find one. So someone please give me a hint for that!

Thanks.