A wireless terminal device performs a communication via the wireless LAN and also performs a communication via a wireless communication network different from the wireless LAN. The wireless terminal device is provided with a determiner for determining whether the device is moving or not, and a measurement controller for measuring a communication power of a communication radio wave transmitted from an access point of the wireless LAN in the position of the determination and for transmitting the information for allowing the operation administrator to specify the measured value of the communication power and the measurement position to the predetermined destination via the above described wireless communication network, triggered by a fact that the determiner determines that the wireless terminal device is not moving.