An object of the invention is to allow a program execution domain to be specified and then a start target program to be started by the specified program execution domain. Disclosed is a remote start system including a communication terminal capable of switching multiple program execution domains from one to another, and a remote start server instructing, via a network, the communication terminal to start a start target program. In the remote server, generated is a switching program start message for requesting the communication terminal to start a switching program that switches a program execution domain to a specific program execution domain for executing the start target program. The switching program start message includes a switching program ID, a parameter for starting the switching program, and a parameter for starting the start target program. The parameter for starting the switching program includes the start target program ID and domain ID.