It is an object to provide a personal data management system which overcomes a problem of data leakage and a nonvolatile memory card applied to the personal data management system. A personal data management system includes a personal data storage medium including a communication control unit which transmits and receives data to/from a terminal, an encoding unit which encodes the received data, and a nonvolatile memory which stores the encoded data; a terminal including a communication control unit which transmits and receives data to/from the personal data storage medium and a server, a display portion which displays the received data, and an input unit; and the server including a communication control unit which transmits and receives data to/from the terminal, a decoding unit which decodes the encoded data, an identification data storage portion, and a unit which compares the decoded data with data in the identification data storage portion.