In alan baddeley's model of working memory, focusing attention is the task of a hypothetical:

I believe the answer is: central executive

alan baddeley's model of working memory is displayed very similarly to the organizational structure that people often spot in office environment.

According to this model, central executive is the part of working memory that had the role to supervise all flow of information that come in and out of the memory, including focusing attention on what type information should come inside.