To collect information easily from a user and provide information to other user while protecting privacy.

If an information provider 40 turns on a switch installed in an information transmission management part, a terminal device 41, at respective established intervals, acquires sensor information from a GPS module 41A and provides an information management server 11 with the information through a network 20. If the information provider 40 turns off the switch, the terminal device 41 terminates the provision of the sensor information. The provided sensor information is stored in the information management server 11. The information management server 11, according to a request of an information user 50, creates statistical information from the stored sensor information and provides the information to a terminal device 51 owned by the information user 50. This invention is applicable to an online service system.