How do I learn English?

I want to learn English and be good English speaker.

I am Japanese and Japanese spearker. I am open source software engineer, so I WRITE and READ English somehow. However I can almost not SPEAK and HEAR English.

I am in Tokyo Japan. I want to learn English speak and hear skill. But I do not have place of learning English. Is there English learning spot in Tokyo, Japan? Or is there good study method of English in Japan? I want to information of these!