Wordpress Customization with Tags

I am working on a project on wordpress project which needs to fetch some Movie data from IMDb.

The client wants an input field on Add/Edit Posts WP Back-end in which he will add IMDb url and hit a button which will fetch out all the details of movie and then i have to save/put them in Custom fields and Taxonomies.

Now the problem i am able to fetch the details successfully but i need to save them to Taxonomies such as Post Tags. I want to load all star cast in Post Tags. While he is in add/edit Post screen in WP Admin.

Any idea how to load those data into Tags. I am getting all the data from IMDb in JSON.

Any help will be appreciated!

via Chebli Mohamed