In this paper, we design a personal support system in telephone correspondence using smart phone. This system consists of a phone-monitor tool that checks the use state of the smart phone, and a personal support tool that gives the user advice on the personal computer. The phone-monitor tool recognizes and manages the state of the smart phone, including outgoing and incoming calls, and sends information via wireless communications to the personal support tool. These tools can select the suitable type of wireless communication (Wi-Fi or Bluetooth), depending on the situation. Our system determines the user's state by using the sensor system on a smart phone and achieves secretarial personal support, including advice on the response confirmation for telephone correspondence using smart phone.