A first communication terminal, unconnected with a communication network, searches for a second communication terminal existing around the own communication terminal. In the communication network, one of a plurality of communication terminals functions as a master having a function of an access point, and the rest of the communication terminals function as slaves of the master. Based on the information included in a communication message received from one or more second communication terminals found through the search, the first communication terminal determines a second communication terminal which serves as a connection counterpart from among the second communication terminals, and configures a communication network with the determined connection counterpart.