1. An information processing terminal comprising, a memory storing instructions; and a processor which can execute the instructions causing the information processing terminal to execute a relay function of making a client which manages data and a service which provides a function using the data managed by the client cooperate with each other via a network, wherein the relay function: receives, from a service of a plurality of services, data including function information for calling a function provided by the service, wherein, in the function information, an action category of the provided function, a processable type of the provided function and a connection destination of the provided function are defined; performs registration processing for registering the function information based on the received data from the service; performs a page request of page data to the client; displays a page based on the page data obtained in response to the page request, wherein the page includes information related to specific data managed by the client and each action category; obtains, when a user instructs a first action category for the specific data via the displayed page, first function information belonging to the first action category from the registered information by the registration processing; identifies, from the registered information by the registration processing, second function information for calling a second function for converting into a processable type of a first function called by using the first function information; obtains the identified second function information belonging to a second action category different from the first action category from the registered information by the registration processing; displays a list based on the obtained first function information and the identified and obtained second function information; performs a data request for the specific data to the client when the user instructs a selection for using the second function information via the displayed list; issues, after the specific data has been obtained from the client in response to the data request, a first request for processing the converted specific data by the second function called by using the second function information, with the first function called by using the first function information; and receives a result of the processing based on the issued first request, wherein, when the requested processing fails due to the second function, a message indicating that the processing of the specific data has failed due to the second function and that the processing of the converted specific data with the first function has not been completed is displayed as the results of the processing.