In an information processing device such as a personal computer of notebook type having a plurality of radio communication functions, a plurality of communication sections can independently and simultaneously perform transmission/reception without increasing the number of antennas and in order to sufficiently utilize the diversity function when a part of communication section is not used, the device includes a plurality of antennas (6, 7), a plurality of communication sections (4, 5) capable of performing radio communication by using these antennas (6, 7), and a switching section (8) for switching the connection state between the antennas (6, 7) and the communication sections (4, 5). When the communication sections (4, 5) are all used for simultaneous radio communication, the switching section (8) connects the communication sections (6, 7) to the antennas (4, 5). When radio communication is performed by using the communication section (5), the switching section (8) connects the numberof antennas (6, 7) corresponding to the communication method of the communication section (5) to the communication section (5).