Hi Debabrata
With ISE, most of functionalities and operations are configured with GUI. in most case we configure ISE with CLI for just the basic configuration like network configuration, NTP, DNS ...
But you can use API instead.
This link contains all nexessary documentation for Cisco ISE: http://www.cisco.com/c/en/us/td/docs/security/ise/2-2/doc_overview/ise22_doc_overview.html
Best regards