Hello my website is under optimizing process. but my doubt is our company is providing new service so we are inserting new pages to website. is these pages automatically indexed by search engines? if they are not indexed, how much time to take index these pages?

Google crawls about once a month. I recommend signing up for Google webmaster tools. Chances are that your website will be fully cached.

No one can tell the fix time, in which Search engines index the pages of your website. Search Engines index them automatically. You can index your pages fast by use following techniques

*Use XML Sitemap
It is use for inform to search engines about interlinks of your website. It helps to index your pages fast.

* Post your links on Social Bookmarking websites
Social Bookmarking websites are use for build quality backlinks and increase the traffic of your website. It are index fast. If you post your links on them, your links are also index fast.