How big the directory include the files and subdirectories within it is?
 

Now, when I right-click a directory, and select property, I only can see how big the directory is, while can't know how big the directory include the files and subdirectories within it is.
Thank you.

what's this under? gnome? kde? some other file manager? please provide enough useful information so we can understand your problem.

from a console though, just run the "du" command on that directory

To get more specific information on directory sizes etc

Open a shell - su to root user - then type

du -h path_to_directory

Sorry for without providing enough useful information about the problem,
the problem is under kde, now it is fixed, thank you.