Recently, GPS receivers, temperature sensors, and lowcost
wireless network by smartphone dissemination camera
or the like is provided has become widespread. Participatory
sensing is a collection method of environmental data using
a smartphone. Spread of smartphones and wireless network
made it possible to transmit easily sensed data to the server.
Sharing using sensor information obtained from the sensor
device of the plurality of users. Participatory sensing is a
kind of crowdsourcing.