Apple iTunes is specific to Apple portable devices. You can maybe find a similar app for Android on the Android Market or possibly Amazon. If you post the name or a description of the app you're looking for someone may be able to help.
do you mean download itunes content to acer android? as far as i know, itunes movies, tv shows have DRM protection, you can't stream them to your android tablet directly, here is an article is talking about this, you may have a look: