Delete some voices from mp3

I have a track mp3: I would like to delete only the spectrum of white (like the picture and keep the rest. How can I do?

If I understand your question correctly, you would need to split the recording into lots of frequency bands, then mute the loud bits in each frequency band, then mix the frequency bands back together.

my file is a simple song in background. I need to keep the song and remove/mute the actor voice over (identified by white color). How can I do it?

Vocal removal is often not possible.
There is an article here about how to approach the task: