A honeycomb structure 10 includes: multiple honeycomb units 11 having multiple through holes 12; and a seal layer 14 that joins honeycomb units 11 with each other via respective closed outer faces 13 of the honeycomb units 11 where the through holes are not open. Conduction times increase due to the greater distance a wavefront must traverse as a heart enlarges. The light-emitting device driving circuit includes a tunable gain-controlled differential amplifier; a first differential output stage and a negative feedback control circuit. Also, the information-processing device, when receiving an instruction to hide a subject window, hides the subject window and a simultaneous display window.