Wireless communication terminal and communication system selection method

A wireless communication terminal capable of selecting a plurality of communication systems, comprising:

• an application information acquisition unit for acquiring a type of used application;
• an evaluation amount calculation unit for changing a communication system selection criterion in response to the type of application and calculating an evaluation amount with respect to a time that is the sum of a communication system switching time and a predetermined time after switching completion where a selectable communication system is switched and maintained, respectively, for evaluating switching of communication systems and steady states before and after switching with a selection criterion as an evaluation criterion;
• and
• a system selection unit for comparing the evaluation amounts thus calculated, selecting any one of communication systems, and determining whether a communication system should be switched or maintained;
• wherein the predetermined time after switching completion is determined on the basis of a variation amount of a communication environment between communication systems before and after the switching estimated by obtained information of the communication environment.