Wingarc1st Inc.

Taiyo Kato

Ko Shimazawa

Kosuke Yoshihara

By converting address informationinput to a geocoding unitinto a tree structure formed hierarchically in an administrative district, generating address tree information obtained by associating latitude and longitude information with at least a node of the lowest layer in each branch of the tree structure and storing the address tree information thus generated in a high-speed accessible memoryto proceed a retrieval while tracing the address tree information in order from a parent node to a child node to narrow down a retrieval range, it is possible to efficiently search latitude and longitude information corresponding to given address information therefrom and to perform a retrieval at a higher speed as compared with the related art in which access is given to a conversion table stored in a disk.

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Tokyo, Japan

Taiyo Kato