1. An information processing terminal which has a web browser by which a client which manages data and a service which provides a function by using the data managed by the client cooperate with each other through a network, the information processing terminal comprising: a memory storing instructions related to a proxy application; and a processor constructed to execute the instructions stored in the memory so as to cause the information processing terminal to: request to start the web browser, in which function information for calling a function provided by a service on the network has been registered, in response to a call specifying a type of function from an application as the client in the information processing terminal to a proxy application; receive an access for a site provided by the proxy application from the started web browser; create page data for calling the function information corresponding to the specified type of function according to the access; and transmit the created page data to the web browser as a response to the access, wherein, responsive to execution of a request using the function information via a page based on the created page data by the web browser, the data managed by the application as the client is processed by using the function provided by the service corresponding to the function information.