A segmented mirror system is essential to realize extremely large telescopes. In this paper, we discuss the conceptual design for the control system of the segmented primary mirror in the SEIMEI telescope employing 18 segments, 72 sensors, and 54 actuators. Two types of control algorithms, Centralized Control System (CCS) and Distributed Control System (DCS), are presented. CCS drives all the segments by integrated information of all sensors and DCS drives each segment by individual information of local sensors, and they are expected to play complementary roles. The effectiveness of CCS and DCS are demonstrated by numerical simulations.
