The invention relates to an information investigation system and an investigation method. A system questionnaire investigation terminal (3) is communicated with a data acquisition server (2), the data acquisition server is communicated with a database sever (1), and a user inquiry terminal (4) is communicated with the database server and the data acquisition server respectively. The system questionnaire investigation terminal utilizes an embedded intelligent device. The system is in SOCKET communication with the questionnaire investigation terminal by utilizing the TCP / IP protocol as a bottom communication protocol and utilizes a LAN port as a physical communication interface. In case of questionnaires, a client only needs to respond a questionnaire sent from the data acquisition server on the questionnaire investigation terminal, then answer information can be immediately uploaded to the data acquisition server and the database server in the background for use of analysis, and the questionnaire investigation is automatically finished. The invention can update questions in the questionnaire in real time, the investigated target user is accurate, the investigation data is real and reliable, the investigation data can be fed back in real time, the invention can carry out continuous investigation of large sample quantity, and the investigation efficiency is high along with low cost.