A method of copying images displayed on a monitor onto a screen of a handheld electronic display unit includes electronically detecting the display unit when it is brought to the monitor, e. Since it is possible to detect the distribution of the collection amount of PMs with good accuracy, it is possible to carry out a recycling process in a state where the collection amount does not become too much, and thereby it is possible to make a reducing-agent supply amount into exhaust gases minimum at the time of the recycling process. This method enables smooth communication between devices in a wireless network since a device which has more available power or can operate for a longer time can become a group owner. 05, wherein the particulate elastomer comprises a halogenated thermoplastic.