You thought correct! ;-)
+9V and ground belongs to the power supply. If you are going to supply this circuit from battery then it is battery. If it is DC voltage coming from another circuit, then this should be it. If the supply comes from a power supply unit, then adjust it to +9VDC. You see 5 of them because 5 points of this circuit needs to be connected to +9V. Instead of having a wire in the schematic going from here to there and get you confused by trying to follow, it is just marked as 9V.
As for ground, it is just a reference. Try to think of it as 0V.
If you have a 9V battery, then +9V would be the '+' of the battery and gnd would be the '-'.
PS: Welcome to the world of electronics! :-D
Hope this helps,
Alexandros