A wireless device including a first radio communication portion configured to effect radio communication with a first external communication device while using frequency bands selected one after another from among a group of frequency bands, a field intensity measuring portion which is configured to measure a field intensity value for each of a plurality of frequency bands belonging to at least the group of frequency bands and which is provided in a portion different from the first radio communication portion, and an excluding portion configured to exclude each of the above-indicated plurality of frequency bands for which the measured field intensity value is higher than a predetermined threshold value, from the above-indicated group of frequency bands.