按照“自顶向下、逐步求精”的问题分析方法，按功能将其分解为5个子问题：新增联系人，查找联系人，删除联系人和修改联系人和显示联系人信息，其中新增联系人资料包括姓名，联系电话和电子邮箱。(In accordance with the "top-down, stepwise refinement" problem analysis method, according to the function of it can be divided into 5 sub problems: new contacts, find contacts, delete contacts and modify contacts and display the contact information, including new contact information, including name, phone number and email address.)