To provide a satisfactory transmitting/receiving environment by reducing an influence from a peripheral environment for placing an information processor.

A main body 10 of personal computer(PC) is composed of a main body 11 of case and a lid body 12 and on inner side face of the lid body 12, a liquid crystal display 13 is provided. Besides, at one side part of the main body 11 of case, a PC card slot 15 and a coaxial connector 17 are adjacently provided. Besides, on the lid body 12, an antenna 18 for radio communication is provided at the upper position of the liquid crystal display 13 and connected through a coaxial cable 19 to the coaxial connector 17. On the other hand, a PC card having a communication function is provided with a coaxial connector corresponding to the coaxial connector 17 on the side of the main body. When the PC card is inserted into the PC card slot 15, the coaxial connector of the PC card is connected through the coaxial connector 17 to the antenna 18 and transmitting/receiving processing is performed.