A press-button circuit, comprising: a first sampling port; a second sampling port; a common terminal; a first node; a first control device, coupled to the first sampling port and the first node, and configured to control a connection between the first sampling port and the first node; a second control device, coupled to the first node and the second sampling port, and configured to control a connection between the first node (P 1) and the second sampling port; m numbers of first press-button sub-circuits connected in parallel, coupled to the first sampling port and the common terminal; n numbers of second press-button sub-circuits connected in parallel, coupled to the second sampling port and the common terminal; i numbers of third press-button sub-circuits connected in parallel, coupled to the first node (P 1) and the common terminal; wherein m, n, and i are integers of 1 or greater; wherein the press-button device is configured to: when the first control device and the second control device are switched on, a first circuit arrangement including m+n+i press-button sub-circuits is provided; when the first control device is switched on and the second control device is switched off, a second circuit arrangement including m+i press-button sub-circuits is provided for the first sampling port, and a third circuit arrangement including n press-button sub-circuits is provided for the second sampling port; when the first control device is switched off and the second control device is switched on, a fourth circuit arrangement including m press-button sub-circuits is provided for the first sampling port, and a fifth circuit arrangement including n+i press-button sub-circuits is provided for the second sampling port; wherein each of the m numbers of first press-button sub-circuits, the n numbers of second press-button sub-circuits, and the i numbers of third press-button sub-circuits includes a key configured in series with a resistor; wherein the resistor is such that distinguishable requirements for key status detection in each of the the first, second, third, fourth and fifth arrangement are satisfied. a first sampling port; a second sampling port; a common terminal; a first node; a first control device, coupled to the first sampling port and the first node, and configured to control a connection between the first sampling port and the first node; a second control device, coupled to the first node and the second sampling port, and configured to control a connection between the first node (P 1) and the second sampling port; m numbers of first press-button sub-circuits connected in parallel, coupled to the first sampling port and the common terminal; n numbers of second press-button sub-circuits connected in parallel, coupled to the second sampling port and the common terminal; i numbers of third press-button sub-circuits connected in parallel, coupled to the first node (P 1) and the common terminal; wherein m, n, and i are integers of 1 or greater; wherein the press-button device is configured to: when the first control device and the second control device are switched on, a first circuit arrangement including m+n+i press-button sub-circuits is provided; when the first control device is switched on and the second control device is switched off, a second circuit arrangement including m+i press-button sub-circuits is provided for the first sampling port, and a third circuit arrangement including n press-button sub-circuits is provided for the second sampling port; when the first control device is switched off and the second control device is switched on, a fourth circuit arrangement including m press-button sub-circuits is provided for the first sampling port, and a fifth circuit arrangement including n+i press-button sub-circuits is provided for the second sampling port; wherein each of the m numbers of first press-button sub-circuits, the n numbers of second press-button sub-circuits, and the i numbers of third press-button sub-circuits includes a key configured in series with a resistor; wherein the resistor is such that distinguishable requirements for key status detection in each of the the first, second, third, fourth and fifth arrangement are satisfied. when the first control device and the second control device are switched on, a first circuit arrangement including m+n+i press-button sub-circuits is provided; when the first control device is switched on and the second control device is switched off, a second circuit arrangement including m+i press-button sub-circuits is provided for the first sampling port, and a third circuit arrangement including n press-button sub-circuits is provided for the second sampling port; when the first control device is switched off and the second control device is switched on, a fourth circuit arrangement including m press-button sub-circuits is provided for the first sampling port, and a fifth circuit arrangement including n+i press-button sub-circuits is provided for the second sampling port; wherein each of the m numbers of first press-button sub-circuits, the n numbers of second press-button sub-circuits, and the i numbers of third press-button sub-circuits includes a key configured in series with a resistor; wherein the resistor is such that distinguishable requirements for key status detection in each of the the first, second, third, fourth and fifth arrangement are satisfied.