日本留学银行证明 急!!!

马上准备去日本留学,申请书上有这样一段话, Please submit an original bank statement of yourself or your financial supporter if either party is to be your main source of income during your study at Osaka University. The statement must: • be issued within 3 months, • be written in English or Japanese, • specify the name of the account holder, and • the balance exceeding the expected living costs in Japan (multiply \71,200 by intended month(s) of stay) in Japanese yen. 请问be issued within 3 months是什么意思?是指资金冻结三个月还是这个证明必须是三个月以内开的?specify the name of the account holder, and the balance exceeding the expected living costs in Japan (multiply \71,200 by intended month(s) of stay) in Japanese yen是什么意思?难道开证明以外还要办什么手续吗?比如担保人收入情况什么的? 另外,担保人是写父母两人还是只写一个?请高人指点!!!