The present invention relates to a real estate information/company (individual) information integrated service system based on a possessor for search, which is capable of collectively using/checking credit information. The real estate information/company (individual) information integrated service system comprises : a real estate information collecting module for collecting real estate information and possessor identification information associated with the real estate information (PIO-R); a PIO-R/possessor identification information associated with credit information (PIO-C) matching processing module for extracting credit information; a PIO-based real estate information/company (individual) information processing module; and a possessor-based integrated information provision service processing module.