1. A method of outputting information about estimated QoEs on a terminal on which plural applications can be executed, comprising: predicting, based on at least one of information from sensors installed in the terminal and statistical information, a first application to be executed first on the terminal; performing QoE estimation for the first application before the first application is actually executed, wherein the QoE estimation is performed by issuing a request for test data associated with the first application to a cloud, receiving the test data from the cloud, measuring a quality factor based on the received test data, and estimating a QoE based on a relationship between the measured quality factor and a corresponding criterion, the criterion being set based on user data of the terminal; outputting information about an estimated QoE for the first application on the terminal based on the QoE estimation for the first application; predicting, based on at least one of the information from sensors installed in the terminal and the statistical information, a second application to be executed next to the first application on the terminal; performing QoE estimation for the second application after the QoE estimation for the first application has been performed, wherein the QoE estimation is performed by issuing a request for test data associated with the second application to the cloud, receiving the test data from the cloud, measuring a quality factor based on the received test data, and estimating a QoE based on a relationship between the measured quality factor and a corresponding criterion, the criterion being set based on the user data of the terminal; and outputting information about an estimated QoE for the second application on the terminal based on the QoE estimation for the second application.