Managing resource information using web services is an important issue in grid computing. Although some standards for grid computing based on web services have been published, the overhead of SOAP/HTTP and XML processing may cause performance problems in the resource information service for the grid. This paper proposes a scheduling update mechanism for resource information cache to meet the performance requirements of the resource information service. We have designed and implemented this mechanism on an information service named Web Service Polling Engine (WSPE) that collects resource information in accordance with WSDM/MUWS standards. From the results of evaluations, we conclude that WSPE can guarantee the freshness of resource information with a stable load on the WSPE server.