self service site possesses the resources and or components of the self service terminal required for the lacked service step 105 is executed in a case that the self service site possesses the resources and or components of the self service terminal required for the lacked service or else the self service site is unable to provide the lacked service to meet a contingency the site server may detect whether the self service site possesses the resources and or components of the self service terminal required for the lacked service after the resources and or components of the self service terminal required for the lacked service is acquired by the site server step 105 is executed in a case that the self service site possesses the resources and or components of the self service terminal required for the lacked service or else the self service site is unable to provide the lacked service to meet a contingency it should be understood that the site server needs to be aware of whether the self service site possesses the resources and or components of the self service terminal required for the lacked service thereby being able to perform corresponding contingency processing steps to restore the lacked service in step 205 the site server selects at least two self service terminals in the self service site according to the.