Howto search WP content from Drupal site

Hi,

As the topic title says: I have Drupal site (mainsite) and in drupal i have static pages and stuff. Then i have WP on blog use (blogsite).
Problem is if i search something from mainsite (drupal) it’s only shown content of mainsite (drupal), not any content fron my blog post (WP)

So how i can search blog content (WP) in mainsite (Drupal)?

Cheers,
-EL

PS. I know that i can use static pages in WP, but this is how my costumer want it…