this question turns to nice way... sperms is used to produce this system(like same as process to produce cpu, memory etc from silicon etc). U can say it's hardware with embedded some software which can be updated also at different leval of ages. Human Brains works by nerons in a 3D structure of unlimited connections, ultimate speed , unlimited memory. Suppose u r taking an input to brain like " how r u?" This datas is processing to brain. who will process offcourse some software required to process these datas. You can say some embedded sodtware which will give instruction to brain then it will execute and then output will come to output device like sound from mouth(i m fine), face expression, etc. Here software can be updated any time and behave as more and more intelligent way... U can say it's software + hardware both....
Truth Can'nt be changed