PURPOSE: To perform optical communication regardless of directivity at all.

CONSTITUTION: Plural antenna elements are spherically disposed and the directivity of the entire directions is obtained. All the antenna elements transmit their own ID numbers and a terminal station 30 which receives the ID number of a fixed repeater station 21 can transmit the ID number of a communicating party and data to the fixed repeater station 21. Since the fixed repeater station 21 transmits the transmitted ID number and data through the network of the fixed repeater stations, the station for which the ID number is coincident fetches the data transmitted after the ID number.