PROBLEM TO BE SOLVED: To enable easily confirming on a display screen a communication route connecting between an arbitrary radio apparatus and a gateway, in a radio network having radio apparatuses connected in a mesh shape.SOLUTION: Based on communication state information which a communication state information acquisition unit 15B acquires from a gateway GW through a communication line L, a radio link selection unit 15C selects a radio link of a link type, constituting a target communication route connecting a target radio apparatus of an evaluation target and the gateway GW, from among radio links according to a designated display condition, as a display radio link. A radio apparatus selection unit 15D selects, as a display radio apparatus, a radio apparatus connected to the display radio link from among the radio apparatuses. A communication route display unit 15E displays on a screen a display communication route constituted by the display radio link and the display radio apparatus, as a target communi
