If u want to study both of them from zero, I suggest u'd better not, cuz when u study more than one laguages at the same time it's easy to mix them up , especially the words and grammar, so I suggest u stady more after u learn well the first laguage and then start the others. So that u learn it well, and it is better that not to learn laguages in the same language family at the same time, but u can learn forexample Japanese and English at the same time.

It is absolutely possible to learn more than one language at a time. The reason I believe this is that I am currently studying Japanese, Russian, and Spanish, and I will be starting my Romanian and French studies shortly, and, quite frankly, I don't think I'm doing to badly. Although Russian is extremely difficult for me, so far. Also, there is a forum which I visit regularly, many members of which are learning multiple languages concurrently... all the time. They have a passion for languages which rivals mine, and just don't stop. :) Not to mention the many famous polyglots throughout history. Mezzofanti was fluent in at least 29 different languages before the internet was invented. I doubt he learned them one at a time. Also Charles Berlitz, whose father insisted that every relative and servant in their household spoke to young Charles in a different language, was fluent in 8 languages by the time he reached adolescence. ( http://en.wikipedia.org/wiki/Charles_Berlitz ) So, it is difficult, but definitely possible.

nop it was so easy if you like you can learn many language in same time just need good mind :P