So, Joseph interpreted Pharaoh's dreams as one dream which meant Egypt would experience 7 years of fat followed by 7 years of famine. And because Joseph proved himself to be a man of wisdom so Pharaoh put him in charge of all of Egypt. (Genesis 41:29-57)
Finally, the butler whose dream Joseph interpreted, remembered and told Pharaoh who in turn summoned Joseph. Then Pharaoh sent and called Joseph, and they brought him hastily out of the dungeon: and he shaved himself, and changed his raiment, and came in unto Pharaoh. And Pharaoh said unto Joseph, I have dreamed a dream, and there is none that can interpret it: and I have heard say of thee, that thou canst understand a dream to interpret it. And Joseph answered Pharaoh, saying, It is not in me: God shall give Pharaoh an answer of peace.Genesis 41:14-16)
And he slept and dreamed the second time: and, behold, seven ears of corn came up upon one stalk, rank and good.
And, behold, seven thin ears and blasted with the east wind sprung up after them. And the seven thin ears devoured the seven rank and full ears. And Pharaoh awoke, and, behold, it was a dream.
And it came to pass in the morning that his spirit was troubled; and he sent and called for all the magicians of Egypt, and all the wise men thereof: and Pharaoh told them his dream; but there was none that could interpret them unto Pharaoh. (Genesis 41:5-8)
No one, not even Pharoah's magicians could interpret his dreams and rightly so, his dreams were from God and only a man of God could interpret them.