A memory stores at least one item of parameter setting information corresponding to respective available environments which are initially set by the user. When the wireless communication function of a portable wireless communication device is made active by powering on, etc., a control section controls a wireless section to allow a search of any wirelessly accessible terminal present within reach of a radio signal. Then the control section infers available environments by comparing the result of the search with surrounding terminal information stored in the memory. Also, the control section reads out control parameter setting information stored in the memory in accordance with the result of the inference and sets the read-out control parameter setting information to the wireless section.