A communication terminal for communicating through an artificial satellite,
wherein the artificial satellite is placed into an orbit in which an
individual satellite orbits on an elliptical orbit so that at least one of
the artificial satellites is always viewable within a pre-defined range of
operational elevational angle in a zenith direction from a service area. A
group of the artificial satellites are satellites on respective orbits
obtained by combining an inclination angle and an eccentricity squared of
said elliptical orbit so that a time period during which an artificial
satellite is viewable from ground is substantially identical and the
communication terminal has a transmitter and receiver for transmitting and
receiving a signal through the group of artificial satellites.
