Currently, there exist different trust models in peer-to-peer application. Each model has an abundance of trust information about trust and reputation attributes which are needed for establishing trust between peers. These trust models canpsilat be easily interoperable due to no approach for integrating in a semantic way the trust information from different models. Integrating trust information in a semantic way is a significant step towards the realization of trust models interoperability in an open system such as Web where resource providers and users are often strangers to one another and universal and correct expressiveness of trust information will be crucial. Therefore, this paper proposes an ontology-based approach for integrating trust information models. Additionally, it is also useful for simplifying security policies specification and protecting sensitive information.