To solve the problem that information retrieval through the Internet by mobile equipment has the convenience that it is utilized at any time, on the other hand, has troublesomeness of an input operation, poor browsability in a browser, problems of communication speed and reading speed, etc. and it is very hard to use as it is.

Necessary information is immediately transmitted without using the browser, and badness of operability of retrieval by the mobile equipment and the problems of communication speed and reading speed are solved by a very simple operation for transmitting a keyword by e-mail by inquiring a prepared data base by using a subject of transmitted e-mail as a key, retrieving items close to the key and transmitting its result to a sender of the e-mail or a third party in real time by the data base.