Communication method in wireless communication network, communication system, wireless terminal and communication control method

[Problem] To provide a communication method, a communication system, a wireless terminal, and a wireless control method that enable information sharing between terminals without forming a group. [Solution] A communication method for a wireless communication network that includes a plurality of terminals (N1-N3), wherein a first terminal (N1) and a second terminal (N2 or N3), which belong to different groups or do not belong to a group, are able to embed optional information in a control frame (101) that is transmitted and received to search for nearby terminals or other groups, and one terminal sends notification information (MSG) to the other terminal by means of the control frame.