A controller, terminal device, control method, and program for handover connections is provided. A controller may acquire estimated communication delay information regarding communication via base stations. A terminal device connected to another base station different from the base station above may acquire requested delay information regarding allowable delay. The terminal device may be notified of settings regarding cells that should be measured for wireless quality by the terminal device based on communication delay information of the base station and requested delay information. Handover control of the terminal device may be performed based on the terminal device reporting the measured wireless quality based on these settings.