A method for accessing attribute data of virtual machines using a control computer. The method generates a control command for accessing the virtual machines of a host computer (S10), determines a command type of the control command (S11), obtains attribute data of a first type of the virtual machines from a database of the control computer if the command type is a first type and the control command is a data query command (S22). The method transmits the control command to a virtual machine manager of the host computer if the command type is a second type (S31), and receives attribute data of a second type of the virtual machines returned from the virtual machine manager of the host computer (S32).
