public int countIncludedString(CharSequence charseq, String str){
		if(charseq == null || str == null){
			System.out.println("�L��Ȓl���͂��Ă�������");
		}
		
		String testedStr = charseq.toString();
		int count = 0;
		
		while(testedStr.contains(str)){
			count++;
			int index = testedStr.indexOf(str);
			testedStr = testedStr.substring(index+1);
		}
		return count;
	}