1. A service processing method in a communication network, comprising: monitoring, by a resource server, availability information of a resource network element, and updating availability information of the resource network element in database of resource network elements, wherein the availability information includes: service processing functions; sharing privileges; and load condition of service processing; receiving, by the resource server, a resource query request transmitted by a resource network element which is incapable of processing a received request for processing a service due to being overloaded; searching for an available resource network element by taking a function required for processing the service, information of which is contained in the resource query request, as a search condition, wherein the search condition further includes category of resource network element, and the resource server further searches for the available resource network element of same category as the resource network element transmitting the resource query request or further searches for the available resource network element of different category from the resource network element transmitting the resource query request; or the search condition further includes operator identifier, and the resource server further searches for the available resource network element that has same home operator as the resource network element transmitting the resource query request or further searches for the available resource network element that has different home operator from the resource network element transmitting the resource query request; determining, according to a preset allocation strategy, from a search result a response result containing information of the available resource network element for processing the service and responding to the resource query request based upon the response result containing information of the available resource network element for processing the service.