A data search apparatus according to an embodiment includes: an input unit; and a storage apparatus configured to store master data names managed with master data. The data search apparatus calculates edit distances between master data names stored in the storage apparatus and input data names input in the input unit, calculates degrees of similarity between the master data names and the input data names based on term frequency and inverse document frequency of the master data names and the input data names, performs processing for narrowing down candidates for the data name being searched for in the master data names based on the calculation results and adjacency information indicating adjacency relationships between the master data names and the input data names, and outputs information indicating correspondence between the master data names and the input data names based on the candidate for the data name being searched for, the candidate for the data name being obtained through the narrowing-down processing.