A scheduler apparatus includes: a calculation unit to determine, on the basis of a time required for switching from a first orbiting satellite that is an orbiting satellite to which an earth station is currently directed to a second orbiting satellite candidate that is an orbiting satellite as a candidate for a second orbiting satellite that is an orbiting satellite to which the earth station is directed next, a future expected throughput between the earth station and the first orbiting satellite, and a future expected throughput between the earth station and the second orbiting satellite candidate, the second orbiting satellite and a switching timing at which the earth station switches a directed satellite from the first orbiting satellite to the second orbiting satellite; and an interface to transmit information on the second orbiting satellite and the switching timing determined by the calculation unit.