Disclosed are a system for providing cloud-based user interfaces and a method thereof. More particularly, a subscriber terminal device according to the present disclosure may include a control command receiver configured to receive a first control command including description information on a template repeated on a UI (User Interface) screen and a second control command including a replication command for the template from a remote application server; a template generator configured to generate a template the based on the description information on the template; a UI resource acquirer configured to acquire a UI resource based on the second control command; and a UI element generator configured to generate UI elements based on replication of the template and apply the UI resource to the UI element.