According to Sun and Msdn it is a design pattern.
According to Wikipedia it is an architectural pattern
In comparison to design patterns, architectural patterns are larger in scale. (Wikipedia - Architectural pattern)
Or it is an architectural pattern that also has a design pattern ?
Which one is true ?
MVC is more of an architectural pattern, but not for complete application. MVC mostly relates to the UI / interaction layer of an application. You're still going to need business logic layer, maybe some service layer and data access layer. That is, if you're into n-tier approach.