According to the present invention, a user can select and use the most suitable route by presenting various routes when using public transportation by using a knowledge base processed by a transfer database of information on the section relation by transfer number for each stop of public transportation. Regarding the public transport knowledge base and the knowledge base creation method, the route information OD0 (10), which is a transit without any transfer between all departures and arrivals, and one transfer between all departures and arrivals One-time transfer route information OD1 (11), two transfer route information OD2 (12) passing through two of all routes between origin and destination, and three times of transfer route three times of route between all origin and arrival route Transit route information OD3 (13) and X times (multiple times) of transit between all departures and destinations Comprising: made of a path information ODX (31), using the Floyd algorithm generates the path information about the path to OD0, without transfer of any once between the start point and the target point path; Inputting a transit route number between stops of the generated route information OD0 without the transfer; Generating one-time transfer route information OD1 about a route to be changed once using the generated route information OD0 without the transfer; Generating two transfer route information OD2 using the one transfer route information OD1 and the non-transfer route information OD0; The third transfer route information OD3 is generated using the two transfer route information OD2 and the non-transfer route information OD0.
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