Provided herein is a web-based system for customer relationship management and a method for operating the system. The system provides a cloud computing system that includes a server initiating a web service, a CRM database associated with the cloud system for recording customer data, and a browser-based user device that launches a browser to log into the cloud computing system for accessing the CRM database. A browser is enabled in the user device to execute a script transmitted from the system for performing a method for operating the system. Through GUIs initiated by the browser while linking with the web service, the CRM database is more easily accessible. A user can obtain all kinds of information relating the customer, can easily reach the customers, and can instantly be made aware of and solve their problems through the web service so as to establish a close relationship with customers.