To communicate image data simply at a free place.
When a line for communication by a sound through a PHS base station 231-1, a PHS line network 232, and a PHS base station 231-2 is connected between a PHS 201 and a PHS 301, an IP address necessary to communicate the image data through a terminal adaptor 202 and a terminal adaptor 302 is communicated through an OCN 233. Then, the image data is communicated to the IP address obtained by the communication through the OCN 233. The image data of a PHS 201 user is displayed on a television receiving set 305 from the terminal adaptor 202 through the terminal adaptor 302, the image data of a PHS 301 user is supplied from the terminal adaptor 302 through the OCN 233 and is still more displayed on a television receiving set 205.