Communication system, and communication device

A communication system comprising:

• at least one first communication device having predetermined information;
• and
• a second communication device for collecting said predetermined information from said at least one first communication device,
• each of said at least one first communication device and said second communication device including
• a first communication means for performing radio communication, and
• a second communication means for performing radio communication using a radio signal different in frequency band from that used by the radio communication performed by said first communication means,
• said second communication device requesting said at least one first communication device to send said predetermined information by using said first communication means and said second communication means of said second communication device,
• said at least one first communication device including
• a specifying means for specifying which one of the first communication means and the second communication means in said at least one first communication device has first received said request to send, and
• a communication control means for making a reply to said request to send by using the communication means specified by said specifying means.