The IoT device 100 collects data on a surrounding environment, and transmits information in a predetermined frame format to the business-organization server 450, to the information server 500, and to the mobile terminal 300 through the wireless network 410, the base communication station 420, and the Internet 430. The IoT device 100 includes an antenna 101, a measurement unit 110, a measured-information collection unit 120, a data storage unit 130, an attribute-information storage unit 140, a frame building unit 150, a transmitting-signal processing unit 160, and a control unit 190.

The measurement unit 110 obtains measured data as various sensors, and obtains image information obtained from a camera and the like, for example. The measured-information collection unit 120 collects, obtains, and extracts the measured data, as information. At that time, statistics processes, such as an average of data, may be performed. The data storage unit 130 stores data that has been collected.

The attribute-information storage unit 140 stores attribute information on the IoT device 100. The frame building unit 150 builds a predetermined transmission frame from the attribute information stored in the attribute-information storage unit 140, and the measured data (sensed data) stored in the data storage unit 130. In the transmission frame, the sensed data is encrypted, and the attribute information is not encrypted. Note that the frame building unit 150 is one example of a packet-signal generation unit recited in the claims.