Thank you for your reply, I tried "pkgchk -l SUNWman" but I obtain "WARNING: no pathnames were associated with <SUNWman>" so I supposed that it was not installed...
Then I tried pkgadd -d SUNWman but I don't have the good file to do that (something looks like a package)...
When I downloaded Solaris 10, I had two "files" (dvd A & dvd B). I did cat file1 + file2 > filename.iso and now I can open the solaris file but inside I don't find an explicit file which allows SUNWman installation.
I have an SUNWman file inside the "Product" file but when I opened it I didn't find something seems to be a package...

Any ideas?