Numerous services are developed using cloud computing technology. It is possible to use service from remote location, not in place of local computer. Accordingly, the research groups predict that the scale of cloud service also will be grown. One of cloud computing's advantage is scalability. It can extend its service scale and range using collaboration between cloud service providers. To make it possible, however, interoperability is required in that environment. Cross-Layered SLA architecture is the cloud service environment that supports interoperability. In this paper, we propose aggregation functions and quality model for QoE metrics and newly generating Service Level Agreement in cross-layered SLA architecture. We expect that this aggregation function and quality model will solve the possible problems in the cloud service area.