A navigation system to be mounted onboard a vehicle, comprising: an input portion for inputting information into the navigation system; a display device configured to display respectively a destination setting screen and a positioning map, search condition parameters setting screen displaying means for displaying the positioning map for setting information related to two search condition parameters; parameter obtaining means for obtaining the information related to said two search condition parameters; information searching means (10, 11) for searching for preferred information based on the information related to said two search condition parameters obtained by the parameter obtaining means; the navigation system being characterized in that the parameter obtaining means is configured for collectively obtaining the information related to said two search condition parameters based on a single input operation that is made by the user via the input portion; the positioning map is formed of a two-dimensional coordinate system having a first search condition parameter assigned to a vertical axis and a second search condition parameter assigned to a horizontal axis; and the information related to said two search condition parameters is a coordinate position selected by the single input operation; and the parameter obtaining means is configured for obtaining levels for the search condition parameters based on the coordinate position; and either the preferred information is route information and the search condition parameters include at least one of estimated driving time, driving distance, cost, and drivability, or the preferred information is facility information and the search condition parameters include at least one of size, age, pricing, and popularity of the facility, wherein the age of the facility is defined such that for newer facilities, only facilities built less than a predetermined period of time ago are considered and wherein the popularity of the facility is determined by comparing the number of users, customers, or guests of the facility during a certain period to a predetermined number. an input portion for inputting information into the navigation system; a display device configured to display respectively a destination setting screen and a positioning map, search condition parameters setting screen displaying means for displaying the positioning map for setting information related to two search condition parameters; parameter obtaining means for obtaining the information related to said two search condition parameters; information searching means (10, 11) for searching for preferred information based on the information related to said two search condition parameters obtained by the parameter obtaining means; the navigation system being characterized in that the parameter obtaining means is configured for collectively obtaining the information related to said two search condition parameters based on a single input operation that is made by the user via the input portion; the positioning map is formed of a two-dimensional coordinate system having a first search condition parameter assigned to a vertical axis and a second search condition parameter assigned to a horizontal axis; and the information related to said two search condition parameters is a coordinate position selected by the single input operation; and the parameter obtaining means is configured for obtaining levels for the search condition parameters based on the coordinate position; and either the preferred information is route information and the search condition parameters include at least one of estimated driving time, driving distance, cost, and drivability, or the preferred information is facility information and the search condition parameters include at least one of size, age, pricing, and popularity of the facility, wherein the age of the facility is defined such that for newer facilities, only facilities built less than a predetermined period of time ago are considered and wherein the popularity of the facility is determined by comparing the number of users, customers, or guests of the facility during a certain period to a predetermined number.