My friend usually find or measure BPM but he stopped doing it for me. Is there a program that helps? Any help is appreciated.

There are many programs, but I think the most used for Project Diva (either PDP or PPD) is MixMeister. Anyways, in the "Show" section of PPD there is a tool called "BPMMeasure" that can be useful too if you want to get the BPM of a song/movie.

Tambien con osu en la creacion de mapas solo poner el mp3 de lña cancion y te pide que presiones t al ritmos de la cancion lugo de eso te saca el bpm