A management method for a computer device, comprising: turning on a power source of the computer device; performing a power-on verification procedure by a basic input/output system, BIOS, of the computer device; determining whether passing through a power-on verification according to a result of performing the power-on verification procedure; starting an operation system, OS, of the computer device if passing through the power-on verification; crashing the computer device if not passing through the power-on verification, performing a monitoring verification procedure after starting the OS; determining whether passing through a monitoring verification according to a performing result of the monitoring verification procedure; persistently turning on the power source of the computer device and performing the monitoring verification procedure again if passing through the monitoring verification procedure; and turning off the power source of the computer device or locking at least one function operation of the computer device and performing the monitoring verification procedure again if not passing through the monitoring verification, wherein the step of performing the power-on verification procedure comprises: determining whether a BIOS memory of the computer device stores a key; determining whether having an external device connected to the computer device if the BIOS memory stores the key, wherein the external device is a USB flash disk and stores a certificate, wherein the key and the certificate are generated by a key/certificate generating procedure performed by the OS, and the key/certificate generating procedure is performed when the computer device previously starts the OS; reading the certificate from the external device if having the external device connected to the computer device; and comparing the key and the certificate to determine whether the key and the certificate are matched, wherein a performing result of determining whether the key and the certificate are matched, is a basis for determining whether passing through the power-on verification procedure. turning on a power source of the computer device; performing a power-on verification procedure by a basic input/output system, BIOS, of the computer device; determining whether passing through a power-on verification according to a result of performing the power-on verification procedure; starting an operation system, OS, of the computer device if passing through the power-on verification; crashing the computer device if not passing through the power-on verification, performing a monitoring verification procedure after starting the OS; determining whether passing through a monitoring verification according to a performing result of the monitoring verification procedure; persistently turning on the power source of the computer device and performing the monitoring verification procedure again if passing through the monitoring verification procedure; and turning off the power source of the computer device or locking at least one function operation of the computer device and performing the monitoring verification procedure again if not passing through the monitoring verification, wherein the step of performing the power-on verification procedure comprises: determining whether a BIOS memory of the computer device stores a key; determining whether having an external device connected to the computer device if the BIOS memory stores the key, wherein the external device is a USB flash disk and stores a certificate, wherein the key and the certificate are generated by a key/certificate generating procedure performed by the OS, and the key/certificate generating procedure is performed when the computer device previously starts the OS; reading the certificate from the external device if having the external device connected to the computer device; and comparing the key and the certificate to determine whether the key and the certificate are matched, wherein a performing result of determining whether the key and the certificate are matched, is a basis for determining whether passing through the power-on verification procedure. determining whether a BIOS memory of the computer device stores a key; determining whether having an external device connected to the computer device if the BIOS memory stores the key, wherein the external device is a USB flash disk and stores a certificate, wherein the key and the certificate are generated by a key/certificate generating procedure performed by the OS, and the key/certificate generating procedure is performed when the computer device previously starts the OS; reading the certificate from the external device if having the external device connected to the computer device; and comparing the key and the certificate to determine whether the key and the certificate are matched, wherein a performing result of determining whether the key and the certificate are matched, is a basis for determining whether passing through the power-on verification procedure.