A wireless terminal device includes a transmitter configured to receive a first packet including path information and a first number of paths of each path and a second packet including a second number of paths between a transmission origin wireless terminal device and a destination wireless terminal device, which is sent from the transmission origin wireless terminal device, and a processor configured to multiply the first number of the paths between an own wireless terminal device and the transmission origin wireless terminal device with another first number of paths between the own wireless terminal device and the destination wireless terminal device and calculate a number of alternative paths of the own wireless terminal device by subtracting the multiplied value from the second number of the paths which is received.