1. A data analysis apparatus comprising: a receiver configured to receive first time series data measured by a first sensor and second time series data measured by a second sensor; a data merging unit configured to generate an ordered pair set using the first time series data and the second time series data; and a cluster generation unit configured to generate a cluster, using the ordered pair set, the cluster being generated in accordance with one or more locations in a coordinate system having a first axis indicating measured values of the first time series data and a second axis indicating measured values of the second time series data, wherein the ordered pair set comprises one or more ordered pairs, each including a measured value of the first time series data corresponding to a specific time, and a measured value of the second time series data corresponding to the specific time.